Archive for the 'Photography' Category

A300 and A350: Sony Alpha line gains two more dSLRs

Thursday, January 31st, 2008

Another week, a couple more new Sony Alpha dSLRs…

Sony has officially announced two new dSLRs, both featuring Sony’s new Quick AF Live View system. This brings the Sony dSLR model lineup to five, provided you include the original A100, which is no longer in production but still available in many outlets.

Only about four months ago, the A100 was Sony’s only dSLR and had been for eighteen months. To many observers, it seemed Sony had lost their direction and might even abandon the dSLR market.

New tilt live view

Tilting live view LCD appears on new Alpha dSLRs.

Sony has effectively shut down the naysayers by releasing the A700 in September of 2007, then unleashing the A200, A300 and A350 in January 2008.

The A200 was announced at the CES show, and only a few weeks later, Sony sends word that the A300 and A350 will ship in March and April.

The A300 specs seem similar to the A200 with the same 10.2mp sensor. The A350 ups the ante with a new 14.2mp CCD sensor.

The feature that sets the two “main-stream” dSLRs apart is the Live View system. The tilt out 2.7” LCD panel allows the user to compose and shoot from a variety of angles. The Quick View system uses a second sensor to continuously monitor the scene:

Here is what the Sony press release has to say:

Sony’s innovative Pentamirror Tilt mechanism directs light to a dedicated live view image sensor, enabling fast and responsive TTL phase-detection auto-focusing, even during live view.

Eliminating the focus delay of other systems, the new models are equally responsive whether using live view or optical viewfinder.
With its two sensor design, Quick AF Live View can even continuously focus-track the subject and provide live view during burst shooting, helping you capture that special moment.

Although I am not particularly interested in Live View, on paper it appears the Sony system is one of the best implementations of Live View yet.

14.2mp logo on new Alpha A350

Alpha 350 boasts 14.2mp (CCD).

The DSLR-A300 kit with a DT 18-70mm f3.5-5.6 standard zoom lens will ship in April for about $800. The DSLR-A350 camera body will be available in March for about $800, and the DSLR-A350 kit with a DT 18-70mm f3.5-5.6 3.9x zoom lens will be available for about $900 at the same time.

After an incredible drought, A-mount shooters suddenly have wide selection of dSLRs to choose from. And yesterday’s huge announcement of the 24mp full-frame sensor is a reminder that the A900/flagship model is yet to come.

All of a sudden, it is a great time to be an Alpha Mount shooter!

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Sony announces new 24mp full frame sensor — can anyone say A900?

Wednesday, January 30th, 2008

Sony has just announced a 24.8MP full frame 35mm sensor targeted at digital SLRS. The new CMOS sensor is said to use advanced circuitry to overcome the limitations inherent in creating a full frame sensor.

Sony full frame sensor

The answer to a hard drive maker’s prayers: the Sony 24.81mp sensor.

The following is from the Sony press release:

The enhanced image quality generated by the sensor’s 24.81 effective megapixel resolution, wide range of graduation expression achieved by its full size broad dynamic range, and the low noise, high resolution, ultra-responsive performance provided by Sony’s Column-Parallel A/D Conversion technique enable it to meet the ever-increasing requirements within high performance digital SLR cameras.

Sony will target for mass production of this CMOS image sensor within this year.

Major features

  1. High picture quality in 35mm full size image sensor with 24.81M effective pixels
  2. “Column-Parallel A/D Conversion method” achieves high S/N and high-speed imaging
    • CDS/PGA(24dB) Circuit (PGA: Programmable Gain Amplifier)
    • 12bit-AD Converter on chip
    • Diversified readout mode
      • All-pixel scan mode 6.3 frame/s (12bit)
      • Window readout
    • High-speed digital output (12 channel parallel LVDS output)

Device Structure
Image size Diagonal width: 43.3mm (Type 2.7)
Total number of pixels: 6236(H) x 4124(V) approx. 25.72M pixels
Number of effective pixels: 6104(H) x 4064(V) approx.24.81M pixels
Number of active pixels: 6096(H) x 4056(V) approx.24.73M pixels
Chip size: 41.0mm (H) x 31.9 mm (V)
Unit cell size: 5.94um (H) x 5.94um (V)

This sounds pretty incredible. We’ve all heard the “too good to be true” rumors, now we have Sony’s announcement that they will offer a full frame, nearly 25mp sensor.

Two things are evident. This has to be the sensor Sony will use in the flagship/A900 dSLR. It has to be. Sony will undoubtedly offer to sell this sensor to other manufactures including Nikon and Pentax. But they can’t call their top-of-the-line camera the flagship unless it utilizes the best technology Sony has to offer. So unless Sony is developing something even more incredible, this has to be the heart of the flagship.

The other point is the press release says the sensor will be mass produced within this year. That tells me the flagship won’t be on sale any time soon. This year, maybe, but those hoping for a PMA announcement with the camera shipping soon afterwards are going to be disappointed. It is possible Sony could announce the flagship at the PMA show, but from the tone of the press release the top of the line Alpha won’t be on dealer shelves for some time.

Don’t worry too much about the A900. It seems that Sony has a whole box of new toys they are ready to announce at PMA. We are sure to see some new Sony dSLR hardware before the week is up.

If you still have your heart set on the flagship, look at it this way…you’ll have several months to stock up on terabyte hard drives to store all those images from that huge sensor

Watch this space for more Sony dSLR news in the coming days.

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Sony Alpha lineup: what does the Nikon D60 mean to future Sony dSLR models?

Tuesday, January 29th, 2008

Don’t look now, but photos of the Nikon D60 are starting to appear throughout the web. Why should A-Mount shooters care about Nikon’s latest offering? Aside from the fact that the D60 probably will use a Sony built sensor, rumors suggest that the D60 may replace the D40, which has been Nikon’s low end dSLR up until now. Before the introduction of the D40, Nikon lagged behind Canon in sales. Although I haven’t seen total world wide sales figures for dSLRs, shortly after the D40s introduction, Nikon began outselling Canon – at least in the Japanese market. There might have been other factors, but the D40 was a landmark camera for Nikon and undoubtedly helped Nikon regain its strength.

Of course the biggest reason the D40 has sold so well is price. The 6MP D40 carried a list price of $599. This was far less than most dSLRs and gave Nikon a real advantage in the dSLR marketplace,

A worthy competitor to the Sony A200?

If the rumors are accurate, the new Nikon will carry a 10.2mp sensor, making it a true competitor to the brand new Alpha A200. Here is where things get interesting. As I said, many rumor sites are indicating that the D60 will replace the D40. Which begs the question, if the D60 will replace the D40, will Nikon retain the $599 price for their introductory model?

If so, this is significant, because it will mean that the brand new Sony A200 will soon have to face a 10.2MP Nikon that will be priced about $100 less.

Of course the details of Nikon D60 are still cloudy, but it is believed that it will be a 10.2MP dSLR with an anti-dust system and similar internal processing as the upper level Nikons.

Nikon hasn’t acknowledged the price of the D60, but it is awfully hard to raise prices in the world of digital cameras. If the D40 is actually going away, I think both consumers and resellers would start howling if Nikon suddenly raised the list price of their introductory model above the D40’s $599 kit price.

If the D40 remains in the catalog, then Nikon is free to price the D60 however they wish. If the D40 has reached the end of the line, however, the D60 almost has to sell for a similar $599 price.

What does the D60 mean to Sony Alpha Users?

So where does that leave Sony and the Alpha lineup? The A200 has at price of $699. That wasn’t a big problem when facing the D40, which could only muster 6MP. Against a similar 10.2MP model, however, the A200 starts looking overpriced.

Alpha A200’s great advantage: Super Steady Shot

The one great advantage the A200 will continue to enjoy is in-body image stabilization. The D60 can’t match that, so the A200 can be considered a superior camera. In fact, unless Nikon were to offer an image stabilization lens as the kit lens (highly unlikely at $599), D60 users will have buy an expensive IS lens to enjoy the image stabilization Sony users get with all lenses. I’m not an expert on Nikon lenses, but most IS lenses I have seen would cost more than the D60 body.

So Sony probably could justify the higher price tag of the A200 on this single feature alone. Those who realize the value of in-body IS would probably feel it was worth it.

But many of the people moving from basic digital cameras don’t necessarily understand the value of Sony’s Super Steady Shot. (Great system, really dumb name.) For the bulk of first time dSLR users, the pixel count is still the determining factor. While some of the better camera shops may take the time to explain Anti-Shake to prospective users, Sony can’t expect the sales people at the big box stores to steer people into the A200.

So that $100 could be a real liability, unless Sony either drops the price of the A200 or introduces a lesser priced dSLR. If the D60 does list for less than $600, I expect Sony to react quickly.

What is your take?

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Will the Alpha A300 be the next SLR from Sony?

Thursday, January 24th, 2008

Ok, the Sony A200 dSLR hasn’t even started shipping yet, but already the rumor mill is racheting up into a fever pitch. The majority of the rumors are claiming Sony will introduce at least one or perhaps two new dSLRs slotted between the A200 and the A700. The new cameras, which the rumor sites have started identifying as the Alpha A300 and A500 models, are supposedly designed to provide Sony with a full range of dSLRs and offer Alpha-mount users a series of competitive price points.

Of course, Sony hasn’t even told us that the flagship SLR will be called the A900, although most camera pundits are already calling it by that name. They haven’t said that there will be an A300 or an A500 or any camera between the A200 and the A700. Then again, Sony didn’t tell us much about the A700 before it’s release and they certainly didn’t tell us anything about the A200 before the announcement. In this matter, it seems Sony is patterning itself after Apple, Inc. Apple’s Steve Jobs is famous for keeping an extremely tight lid on future products and the Mac rumor sites drive their readers crazy trying to guess what Apple’s next move will be. It isn’t difficult to draw a parallel to Sony’s dSLR camera division, which seems more secretive than the other top-ranked digital SLR camera makers.

Alpha A100

What’s next for Sony’s Alpha dSLR lineup?

So the rumors could have at least a grain of truth to them. There are even “leaked” photos of the supposed middle of the road cameras. You can see one set of leaked A300 photos at Photogrqphy Bay. Slash Gear offers the same tilt out, LCD Live View Alpha A300 photos.

Of course, in the days we find ourself in, photos are hardly overwhelming evidence. You can create some very convincing fakes in Photoshop, especially if you mix parts of various existing cameras. In the Apple Inc. rumor scenarios I mentioned, there have always been dozens of very well done, fake images floating around, especially before an upcoming product launch. Even some big name media outlets have published these fake photos as the “real thing,” then they had to swiftly backpedal when the actual Apple announcement was made.

So I am not going to speculate too deeply about the supposed new models, other than to wonder if there is a valid reason for Sony to offer any models between the A200 and the A700.

On the face of it, I don’t understand why Sony would need a fist full of camera models. To my mind, the A200, A700, A900 lineup seems to cover most dSLR users. If anything, I think Sony could use a stripped down dSLR model priced beneath the A200 that would coax more point and shoot users to move into a dSLR. At the same time. however, I am perfectly willing to concede that Sony has their own strategy for the Alpha line and they are more qualified then I am to plan their future dSLR offerings.

Minolta, of course, offered a plethora of models once they started to flesh out the A-mount line. If you check out Mike Hohner’s great Sony/Minolta Auto Focus body list, you will see that Minolta sold models to fit every possible need and price range. Did consumers really demand that many different SLR bodies? Apparently Minolta thought they did.

Details are sketchy, but the supposed leaked images show a camera similar to the A200 with a tilt out LCD screen. The implication is that the new model(s), if they are real and not some Photoshop wizard’s fantasy, will have Live View.

Now remember these are rumors we are talking about here — not confirmed facts. Shortly before the A700 was launched thee were some very respectable camera writers suggesting that the Advanced Amateur dSLR (which was released as the A700) would have 14mp and feature a 1.25 crop sensor. Neither came to pass, the A700 uses a very respectable 12mp, APS-C sensor. But many enthusiasts were disappointed that the camera did not live up to the rumors. If you are going to play the rumor game, you have to accept that fact that some, if not most, of the information will be inaccurate. That’s just the way it is.

Having said that, a lot of Alpha enthusiasts are speculating that Sony will release a new dSLR model priced around $1,000 US — smack in between the A200 and the A700.

Hmm… That places the mystical A300/A500 about $300 or so more than the A200. It could happen…but what exactly could Sony tack on to the A200 to make it worth three hundred more than the A200?

Live View? Maybe that is worth three bills to some people — it certainly isn’t to me. There are a few legitimate uses for Live View, but I would guess I would use Live View for less than 5% of my shooting. Is that worth $300 to you?

The other laughable suggestion is that Sony will equip the fictional $1,000 camera with a larger sensor…maybe the same 12.7MP sensor the A700 uses.

I ask you, if Sony suddenly unleashed a 12mp dSLR priced at a grand (list), what role would the A700 play in the Alpha line up? If you had the chance to buy an A200 style body with the sensor from the A700 at $1,000, would you ante up the extra $500 or so for an A700? Maybe some would, because the A700 is definitely a superior camera. For most users, however, the thousand buck 12mp dSLR would do nicely, effectively cannibalizing sales of the A700.

There are, of course, some limitations to the A200. AFAIK, there is no PC sync port and it doesn’t offer provision to tether the camera to a computer. I could be wrong on both counts, because the Sony A200 press release doesn’t address these issues. But I don’t see evidence of a PC port in the advance photos and the Alpha A100 lacked these features, so I am assuming the replacement will as well.

Would an 10mp A-mount SLR with Live View, PC sync and tethered shooting be worth $300 more than the A200? I’m not sure, but it would definitely be a step in the right direction. What’s your take on the A300/A500 rumors?

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Sony Alpha A200: new low cost starter dSLR

Tuesday, January 8th, 2008

Sony quietly announced a new dSLR model Sunday, January 6. The new Alpha A200 dSLR is positioned as a replacement for the now discontinued A100 dSLR. The Alpha 200 will anchor the Alpha line as Sony’s starter SLR model, providing a low cost point of entry for those unable or unwilling to spend the cash needed to acquire an A700.

New Sony A200

Sony will ship the A200, a new low cost dSLR, in February.

Photo: Sony Corp, used with permission

The new 10mp dSLR offers a number of improvements over the A100. Sony says the new camera is faster, lighter and easier to use. Two of the obvious enhancements include a larger 2.7 inch LCD screen and the availability of a vertical battery grip. Sony also claims the new camera offers reduced image noise and uses the same auto-focus system as the Alpha A700, which is said to be 1.7 times as fast as the A100.

The new dSLR includes the usual Sony/Minolta touches; Super Steady Shot, Sony’s DRO image optimizer, BIONZ processing engine and the anti-dust vibration system on the CCD sensor. Naturally the A200 accepts all of the A-mount lenses available for the A100 and A700. Sony and Minolta flash units compatible with the A100 will also work on the A200.

Those disappointed that the A700 did not carry on the legacy of the Maxxum 7D controls, will not find anything to cheer about on the A200, either. Sony reduced the control knobs to one and adopted a menu control to replace the missing dial.

The Sony press release doesn’t mention a PC Sync port (say it isn’t so!), so, like the A100, it is possible that the A200 will lack the ability to work with studio flash unless you use a hot shoe adapter. There is also no mention of tethered shooting, so you may need the more fully capable A700 if you want to shoot tethered to your computer. I hope I’m wrong about this and Sony just failed to mention it in the press release. But I’m not holding my breath.

I haven’t seen a picture of the new grip for the A200, but Sony identifies it as the VG-B30AM ergonomic vertical grip, so it is not the same grip used on the A700. Like the A700’s grip, however, the VG-B30AM will provide space for two InfoLITHIUM® batteries.

Now the real interesting part: the price. Sony says the A200 equipped with the DT 18-70mm f3.5-5.6 3.9x zoom lens will list for about $700 and will be available in February. They don’t quote a body only price, but as a benchmark, you saved about $100 when you purchased the A100 without the kit lens.

The A200 should provide Sony with traction in an area where they dearly need it — the low-end, starter SLR market. Priced at roughly half the price of the A700, the new camera should go a long way toward building Sony’s market share and greatly expand the ranks of A-mount shooters.

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Are you smarter than your camera? 5 ways to prove it

Friday, December 28th, 2007

Modern dSLRs are technological wonders. They are crammed with components, sensors, LCDs and advanced circuitry. They do everything but talk — and a few are working on that.

Despite all this technical wizardry, the average dSLR is fairly dumb. It can’t think. It knows nothing about art, composition or lighting effects. It doesn’t care if you are photographing a beautiful sunset or the local garbage dump. It doesn’t see the difference and wouldn’t care if it did.

Yet, far too many dSLR owners allow this non-thinking, non-appreciative hunk of electronics to rule over their photographic endeavors. “The camera knows best,” is their motto and the more automatic controlled features their cameras have the better the like it.

True photographers know better. They can appreciate the wonderful features camera designers have incorporated into their hardware, but they remain the master of the thing. They aren’t afraid to use manual modes, and more importantly, they know when they should. They are smarter than their camera and their work shows it.

Under perfect conditions — bright, overcast day with no shadows and lots of reflected diffuse light — any camera can capture wonderful images. The problem is those perfect conditions don’t come along very often and they don’t exist indoors. Or in a shady forest. Or at night. Or…well you get the idea. Most of the time, you and your camera have to work together to get the best images. You have to be a team –and in any team there has to be a leader. You have to step up, overrule your camera and force it to capture the images you want.

The more I use my digital cameras, the more I find myself reverting to some sort of manual control. That doesn’t mean I never shoot in a fully automatic mode — it’s just that more and more often I find that my knowledge and experience lets me make better decisions than my camera. Sometimes I’m wrong and the camera actually knows best. Much of the time, however, my images show a marked improvement when I take control.

How do you develop this knowledge? It can start gradually, by occasionally experimenting with manual settings. If you always shoot fully automatic, in the program mode, try a few of these suggestions next time you are shooting.

Turn off auto focus.

Auto focus is useful and can be a lifesaver many situations. However, if you always let your dSLR select the focus you may be missing out on some great images. You might prefer part of your subject be out of focus. Its an artistic decision and your camera can’t make that decision for you. In addition, no matter how fast camera makers make their AF systems, pre-focusing will always be faster. So try using manual focus when it is appropriate.

Switch out of the program mode

I am finding less and less use for the program mode when I shoot. Since I understand what type of image I am trying to capture and the camera can’t read my mind — I find I am far better at selecting the best combination of aperture and shutter speed to get what I want. Camera makers have gone to great lengths to add program modes like sports, night, portraiture and the like. The idea is you can set your camera to the appropriate mode and forget about it. Sometimes this works, but I find I get better results when I determine the optimal settings. lately, I have been shooting almost exclusively in aperture priority. I set the F-Stop and the camera selects an appropriate shutter speed. Occasionally I will use shutter priority — especially if the light is shifty and I want to make sure I don’t fall below a certain speed. Sometimes I will use full manual — when I want to ignore the camera’s meter in order to get exactly the shot I have in mind.

Of course you don’t have to use any single mode for an entire shoot — many times I will find myself shifting between all four modes during a busy session. The thing is, you have to learn which modes work best for which situations. So next time you are out, switch out of program mode for at least part of the time. Once you learn how to make decisions your dSLR could never make on it’s own, you may find the program setting will become your least used mode.

Play around with exposure compensation

Most dSLRs offer some form of exposure adjustment, which will allow you to override the actual meter reading by a set number of stops. Much of the time, the default setting will be very close, but if you are attempting a special effect or the light is tricky, exposure compensation can be your best friend. Learn how to use it to your advantage.

Experiment with contrast

If your camera offers contrast adjustment, learn how this can improve your images in varying lighting conditions. If you are shooting outdoors at noon on a bright, cloudless day, normal contrast may make your images appear awful. See if toning down the contrast will soften the shadows and eliminate hot spots. If the light is weak and dull, can you improve the image by cranking in some additional contrast?

Vary your flash settings

It’s true. camera makers have created some wonderfully intelligent flash units. Even the built in flashes can produce stunning results under the right conditions. But there are plenty of times when the flash should be overruled. Start with flash compensation. Try more or less compensation to see how the light changes. Experiment with different shutter speeds to see how that affects the background. If you have a separate flash unit, get a cord and try shooting with the flash off the camera. Experiment, You’ll get some duds, but you will also get some wonderful images. And you will never allow your camera to dictate how your flash should be used in the future.

I urge you to try all of these techniques when you get the chance. You might not use every one every time, but make it a point to try at least one of these each time you head out with your dSLR. If you do, and you ware willing to learn from your successes and your failures, you will quickly se your photographic IQ surpassing your cameras. When you are smarter than your camera, you will be well on the way to capturing some outstanding images.

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Street photography: are you licensed to photograph in public?

Thursday, December 20th, 2007

Has anyone ever tried to prevent you from taking photographs in a public place? I’ve read about other photographers who have been harassed while they were capturing images even though they had every right to do so. For the last thirty years, I could say that no one had ever interfered with my photographic endeavors. After last week, that is no longer the case.

I had been asked to photograph a corporate Christmas event in Charlotte, NC. That went off without a hitch. It was a fun, festive event, but I was tired and hungry by the end of the day. I wanted to go home, eat something an relax before I started post processing my RAW images.

As I walked across the courtyard to reach my truck, I just couldn’t resist hauling out the camera to shoot the Christmas lights. The place was wonderfully decorated, and even as tired as I felt, I noticed a number of interesting photo opportunities.

Assault on freedom — the first guard

After about ten minutes, however, a uniformed security woman appeared.

“Sir, you cannot take pictures in this area.”

I was rather surprised — the property owners had gone to great expense to decorate the area with thousands of lights, a 80 foot artificial tree and dozens of lighted topiary plants that looked like dancing bears. Yet they didn’t want to allow photographs of the scene? So much for the “joy of the season” thing.

I wasn’t completely sure that they actually had the right to prevent me from taking photos in a public courtyard where the public is invited to visit shops and a food establishments. Still, I was on their premises, so I meekly packed up my camera and left.

About a 150 feet away, however, I found myself standing on a sidewalk. A public sidewalk, paid in part by taxpayer dollars. Out came the camera again. It was not as convenient as shooting from inside the courtyard, but I was able to capture some nice holiday light images.

“Sir, you cannot take pictures in this area.”

Security guards: two — Freedom: Zero

A different security guard, standing within the courtyard, started yelling at me.

I ignored her.

“SIR YOU CANNOT TAKE PICTURES HERE!”

Sigh. I don’t know which bothered me more; the fact this woman was haranguing me or that a security guard working in the United States of America actually thought she had the right to prevent me from taking photos of a lighted building while standing on a public sidewalk.

I am not a lawyer, but I have been taught through the years that in the USA, a photographer has the right to photograph nearly anything while in a public place. The only exceptions are certain military and nuclear facilities. Otherwise, no one has the right to prevent you from photographing while in public.

The problem is that the security guards I ran into probably never read any of this material. They had obviously been instructed that photographs were not allowed, and were zealously attempting to carry out their duties, failing to realize that they had no right to prevent me from photographing anything I could see while standing on that sidewalk. In fact, strictly speaking, they were breaking the law.

There rather large gray area when it comes to a photographer’s legal rights. Most photo books I have read on the subject insist that (in the USA) a photographer has the right to photograph in any public place. Some even claim that if someone invites the general public into a place — such as a shopping mall — they can’t prevent a photographer from taking photos in that place.

Gray areas allow private guards to violate photographer’s rights

I’m not altogether sure about that. This is were the law gets rather gray — most concerts and theaters have restrictions against photography. I suppose you could make the argument that these events are not “public” since only those who buy a ticket or receive a pass from the owner can attend.

Still, the law is rather clear about photographs in true public places such as streets and sidewalks. Under federal law, no one has the right to prevent you from taking pictures in these areas.

States, counties and cities probably have the right to pass ordinances preventing street photography, but very few have done so. Unless there is a specific ordinance of this nature, no security guard has any legal right to keep you from using your camera while in a public area. But it appears that many guards and property owners are unaware of this fact.

The anti-photo law that made photography legal in New York

Ironically, the clearest rule about photography in public came about when the City of New York attempted to prevent photos from being taken in the NY Subway system. Citing security, the city was set to enforce a strict law that would have required a permit to photograph anywhere in the subway.

Fortunately, there was great hue and cry and the city quickly backed down. In doing so, they made it abundantly clear that all photography or cinematography was permissible in the subway, provided the camera user does not interfere with those using the subway. Thus, because NYC attempted to block photography, then reversed themselves and made it clear it is legal, everyone, including security and police officers now know that a photographer has the legal right to use his camera in the subway. There is no gray area any longer, the city has gone on record that it is legal.

Despite this victory, I am becoming quite concerned about photographer’s rights in the US. Unless photographers speak up and challenge those attempting to make photography a crime, it might become accepted fact that many places are off limits to cameras. The freedom to use your camera in public will be greatly curtailed — creating a great void in the photographic record of US life.

Thomas Hawk’s DIgital Connection blog has a series of lively posts on photographer’s legal rights (or lack of them).

An older post, archived on BoingBoing, describes a freelance photographer’s encounter with security guards in San Francis’s MUNI public transit back in 2005.

Bert P. Krages II, Attorney at Law has prepared a guide entitled Your Rights and Remedies When Stopped or Confronted for Photography

Has this happened to you?

Has this happened to you? Have you ever encountered a security guard, police officer, property owner or anyone else who attempted to prevent you from taking pictures when you had a perfect legal right to do so?

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Full frame sensor with image stabilization revisted

Friday, December 14th, 2007

There is intense interest in the yet unnamed and unannounced full frame Sony Alpha (possibly to be called the A900?) among Alphatracks readers. I recently received another e-mail suggesting further ideas regarding the full frame sensor with in-camera image stabilization problem. Or non-problem, depending on which theory you wish to follow.

This time around, Marek Kaszycki weighs in with his analysis of the situation.

I’m not an engineer, yet I’d like to provide another perspective on the possibilities of SSS working with a full frame sensor.

Looking at tests of stabilization systems, I can’t help but wonder about two things:

1. Effectiveness of stabilization overall.

2. Effect of lack of stabilization.

Starting with the latter, it’s fairly obvious that if you take a 3600×2400 image (ca 8.6 megapixels) and have a shake that causes smearing of fine detail across two pixels, you’re losing 50% of the linear resolution in that direction. Since losing 50% of resolution in one direction leads to the perception of losing half of the resolution overall (extra resolution in the other direction is redundant), this means losing 75% of the pixel count, reducing the perceived resolution down to 1800×1200, ie. ca. 2 megapixels. Worse shake leads to further image degradation with even further loss of resolution, down to unacceptable levels.

I used the images from some dpreview reviews for Minolta cameras:

http://www.dpreview.com/reviews/KonicaMinoltaA200/page7.asp

http://www.dpreview.com/reviews/KonicaMinolta7D/page19.asp

http://www.dpreview.com/reviews/KonicaMinoltaZ5/page6.asp

They have different sensor sizes and pixel counts, so I will use relative numbers.

The Z5 is 5 megapixels, 2560×1920, Dynax 7D is 6 megapixels, 3008×2000, and Dimage A200 is 8 megapixels, 3264×2448.

The Z5, at 420 mm equivalent focal length, produces a blur about 30 pixels long, the D7D, at 75 mm equivalent, about 15 pixels (at 1/4th, with AS on, curiously), and the A200 about 35 pixels. Relative number of pixels per frame height is: 1.5%, 0.75% and 1.4%.

Since D7D handily corrected blur at 1/8th of a second, which is almost ten times longer than ‘handholdable without stabilization’ 1/focal length rule, with about 0.5 pixel shift, it’s perfectly reasonable that the system has a three stop effectiveness with 0.75% frame height shift (0.12 mm movement of a 16 mm high sensor!).

Let’s say the system would correct for even more, and would move the frame within 4% around the sensor boundaries. This would correct about 5.5 stops slower than at the reciprocal of the focal length rule, while moving the sensor only about 0.96 mm up and down, and 1.44 mm left and right. Amazingly simple, let’s simplify that further and allow for 1.5 mm movement in both axes in both directions, which is a bit extreme.

Taking a full frame film gate, and a full frame shutter (both of which have sligthly larger clearance than 36×24 mm), as well as a full frame sensor, we lose 3 mm of the sensor to allow SSS to work. It boils down to 33×21 mm available area, or 31.5×21 mm to allow 3:2 aspect ratio. This means a “crop factor” of only 1.14x, making a 24 mm lens into a 27 mm one. Still a loss, but I think it’s an acceptable one.

What could Sony do to make us happy? In this rather extreme example (3 mm movement), three things:

1. Setting SSS effectiveness in the menu. Restrict movement to 0.25 0.5, 0.75, 1, 1.5, 2, 2.5 and 3 mm, independently for horizontal and vertical axes (e.g. 2 mm for vertical axis and 3 mm for horizontal, making image area equal to 33×22 mm, or less than 1.1x crop).

2. Letting users choose whether to always crop the image to preset restricted movement, leave it as it is, to crop it in software, or crop it automagically (the camera would crop based on restricted movement and detected underexposure).

3. When SSS is off, no crop occurs, unless preset in the menu (automatic mask in the viewfinder).

Back to the 3600×2400 sensor (8.64 megapixels), a 31.5×21 mm available area is 3150×2100 pixels, 6.61 megapixels. Not a huge loss in resolution, either (linear: 14%, planar: 23%).

All of these options are possible, no extra gain, or exposure increase is necessary, the sensor is full frame when doing critical work, and slightly smaller when not.

Regards, Marek Kaszycki

Past posts in this series:

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Your Minolta SLR: make it new again with real leather

Wednesday, November 21st, 2007

Is your Minolta SRT model looking a little rough? What about your old reliable XD-11? Does it still look pristine? Maybe your XG-7 could use a little refurbishing. If you got an old, but well loved Minolta SLR, you can make into something very special. With a little elbow grease and a replacement leather kit from CameraLeather, you can turn your run-of-the-mill SLR into a one-of-a-kind show camera.

While CameraLeather won’t necessarily make your camera take better photos, it will definitely increase your pride in ownership. I’ve always found that when I value a special instrument, I tend to work harder at getting a result that matches the quality of the tool. So in the end, these kits might just improve the caliber of your photos after all.

CameraLeather offers many colors and textures

Make your classic Minolta a real standout. CameraLeather offers a wide variety of colors and textures as these SRT models demonstrate.

Photo: CameraLeather, used with permission

CameraLeather, as the name implies, offers a line of leather kits that any handy DIYer can use to resurface the grip area on their classic SLR. DSLRs, with their molded, composite bodies probably don’t lend themselves to leather covering. The older metal bodied cameras, on the other hand, are the perfect target for one of these leather kits. Since CameraLeather offers a wide range of colors and styles, you an customize your aging SRT or XD-11 to look better than new. Best of all. the kits are inexpensive, ranging in price from to $10.50 for synthetic materials to $44 for the exotic kid skins. Most of the pre-cut covering kits for 35mm SLRs are less then $20.00. The biggest investment required in the time you invest to remove the old overing and apply the new one.

Selection of leather styles

CameraLeather offers an incredible array of coverings.

Photo: CameraLeather, used with permission

To my mind, these leather coverings evoke an earlier era, when wealthy people would tote beautifully crafted classics with them on far flung-travels. I could imagine seeing one of these aboard the Orient Express or on a trip up the Nile in one of Agatha Christie’s novels. These cameras wouldn’t look out of place in a stateroom on the Titanic, either.

Too British for you? How about a fellow named Gatsby slinging one of these over his shoulder, bound for a day of yacht racing off Newport, Rhode Island. I would think a leather endowed XD-11 would be just his thing.

Ok, enough romanticizing. These leather covered cameras are uber-cool, but are they practical? I don’t want to lock my camera up in a display case — my cameras are for taking photos. How well will these coverings hold up?

That is one of many questions I had for Morgan Sparks of CameraLeather. Following are my questions and the answers provided by Sparks::

How difficult is it to recover Minolta SRT and X series SLRs?

Minoltas, as a group, are pretty easy to recover. Some of the old hard coverings on the SRT’s require some effort to get off cleanly. The XG, XD and X-700 series are easy to strip and clean. The “support” section of the site is fully applicable to all Minolta SLR’s.

How well does the leather stand up in use? Can someone use the camera regularly without damage from sweaty palms or oily skin?

All our materials hold up well in normal use. Some of them are very tough, like the reptile leathers. The kid skins in the lighter colors may show some dirt in hard service. We do not get any complaints about early failure, and we have been doing this since 2000.


Has anyone tried your fabric on lens barrels? After long use, some of the rubber grips on my Rokker lenses have stretched or come off completely. It might be interesting to buy a matching fabric sheet and cut it to fit the lens, making the lens and camera match. Impractical? What do you think?

Our “Griptac” material makes an excellent lens barrel grip, but the “gravel” texture seems to put most people off. It works great, but I can’t get too many people to use it; they are used to a checkered grip. I’ve found the best way to put a new focus ring on your lens is to buy an old Sears lens for $5 and cannibalize it!

Hmm. This seems like a very interesting project. There are a couple of hitches, however. First, it’s been years since I actually shot film. I still have some of my old SLRs and it might be fun to take one out and play with it now and then, but the film train has pretty much left the station. And she ain’t ever coming back.

Secondly, I am at a loss to think of which of my old SLRs I would want to cover. My old SRTs are pretty well used. They have been dropped, nicked, exposed to all manner of hard use — one has even been run over by an errant race car.

Nice leather covered Minolta XD11

Other metal bodied Minolta SLRs, like this XD11 are also good candidates for the leather treatment..

Photo: CameraLeather, used with permission

Don’t get me wrong, I’m not careless about my equipment, but sometimes getting the shot is more important than keeping the camera in pristine condition. So these scars are a badge of honor as far as I’m concerned. But I’m afraid an immaculate leather covering would clash with the scared metal housing. I would have to distress the leather to make it match — that doesn’t seem like a very good idea.

I do have a mint Minolta SR-7 and I’m sure a leather covering would look great on it. CamaeraLeather doesn’t offer a kit expressly for the SR-7, but it is so close in appearance to the later SRT series that I think I could adapt a SRT kit. If not, CameraLeather sells uncut sheets of the adhesive backed leather so I could go that route and custom make my covering.

But as I said, the SR-7 is in mint, nearly unused condition. It probably isn’t greatly valuable today, but I would guess in the coming years it might be worth something. But it I remove the original hard covering and replace it with leather, the camera probably will not have any real value to a collector. Sigh.

Maybe I could look around for an old XD-11 on ebay. It would lend itself well to the refined look of leather and Minolta made enough of them that they wouldn’t be as much of a collector’s item as the older SR model.

Precut leather sheet

Leather is precut for every supported camera model.

Photo: CameraLeather, used with permission

I wonder what it would be like to shoot film again? I’m going to have to think about that. I would never return to film in place of digital for my professional work…but it might be fun to haul around a leather bound film SLR for family events and the like.

While I’m studying on the problem, if you have a suitable candidate for a leather treatment, check out the CameraLeather website.

If you do try your hand at recovering an old Minolta SLR, send in some photos so I can share with other Alphatracks readers. Who knows, maybe we can spark a revival of classic Minolta SLRs.

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What exactly is a Single Lens Reflex anyway?

Sunday, November 11th, 2007

Alphatracks has always been aimed at Sony and Minolta SLR users. Not that there is anything wrong with non-SLR gear, There have been numerous great non-SLR cameras sold under the Sony/Minolta brands. You have to draw the line somewhere, however, and since I have primarily used SLRs, I like to stick to what I know.

I’ve noticed that many readers are somewhat unclear as to which cameras are actually SLRs. Some appear to think it means any camera that uses interchangeable lenses. (Which is not the case.) Others mistakenly apply the term to so-called “bridge” or pro-summer cameras. These cameras typically rely on an electronic view finder (EVF) , which disqualifies them as a dSLR. So what exactly makes a camera SLR?

Shouldn’t that be a MLR?

Mirror box of Maxxum 7000

It’s the instant return mirror (and supporting system) that puts the reflex into a SLR.

Most people know that SLR stands for “single lens reflex,” which in itself is fairly confusing. After all, nearly 100 percent of the SLRs ever produced are designed with an interchangeable lens mount. Shouldn’t these cameras be called Multiple Lens Reflex cameras?

To understand just why we refer to these cameras as single lens units we need to examine a bit of camera history, The early cameras, such as those used by Matthew Bradey during the American Civil War, recorded a single image at a time. The photographer looked through the lens, focused, composed and then inserted the film plate behind the lens to make an image. While the entire process was crude by today’s standards, the photographer enjoyed great control, since he looked directly through the actual imaging lens to compose the shot.

While this was satisfactory for still life, portraits and landscapes, this process did not lend itself to rapid photography. These early cameras could only record one image at a time. Which is why you have never seen a motor-driven view camera.

Realizing the need to offer sequences of exposures, camera makers begin to experiment with various roll-film designs, With a roll of film in the camera, the photographer could fire off continuous images without reloading. While this improved throughput dramatically, it caused another problem. The roll of film had to pass closely behind the camera’s optics, which meant that the photographer could no longer look through the camera lens to design the shot.

Rangefinder cameras appear to keep things in focus

There was no problem with the lower-end consumer roll-film cameras, because these generally used an inexpensive “fixed-focus” lens. Better quality optics require the lens to be focused, however, and as we’ve seen, the photographer couldn’t look through the lens with a roll-film camera. One of the first solutions to this problem was the Rangefinder — a type of camera that offered a distance measuring scale in the viewfinder. By determining the range from the viewfinder, the photographer could then adjust the focus to match — usually with very good results.

Twin Lens Reflex cameras offer another solution

Typical Twin Lens reflex.

Twin lens reflex used upper lens to focus, lower lens actually took the photo.

While the rangefinder type cameras worked well, the camera industry is always evolving. A second method of allowing the photographer to focus and compose appeared in the “Twin-Lens Reflex” cameras. These cameras used two identical lenses, arranged one on top of the other in the manner of an over-and-under shotgun. The film winds past the lower lens, while the photographer can focus through the upper lens. Since most of the twin-lens cameras were fairly bulky, designers added a mirror and ground glass to the top of the camera, hence the term “reflex.

Now the user could hold the camera at waist level and look down at the ground glass which previewed the image via the mirror behind the upper lens. As the user adjusted the focus on the upper lens, a gear mechanism moved the lower “taking lens” to match.

While both rangefinders and twin-lens cameras offered a credible way to focus and preview a shot, neither allowed the photographer to look directly through the imaging lens. This made exact composition difficult in certain situations.

SLRs take cameras another step forward.

Light path through a single lens reflex camera.

Cut-away view shows the light path through a typical SLR. Light enters through the lens, hitting the lower mirror, where it is reflected upwards. It then strikes the top of the prism, where it is reflected again to strike the front of the prism. It is reflected yet a third time to pass through the viewfinder.

In their quest to allow users to see through the actual “taking” lens, camera makers turned to the periscope — a simple device using two mirrors placed at opposite angles to bend the light path. Periscopes are easy to understand — any kid can construct one from a couple of mirrors and some scrap wood. In a camera, the lower mirror is placed at a 45 degree angle directly behind the lens. Light striking the mirror is projected upwards to a ground glass. A pentaprism, which contains two additional mirrors, is located behind the viewfinder. The prism is used to flip the image so it can be viewed “right-side up”

There is just one hitch. If you’ve been paying attention, you no-doubt realized that the lower mirror blocks the light path to the film (or digital sensor as the case may be.) Now the photographer can look though the lens, but the image can’t be projected on to the film plane.

So the camera designers had to add another wrinkle. They had to move that mirror. Just long enough to make an exposure, since when the mirror moved, the photographer couldn’t see anything through the lens. So they designed the “instant-return” mirror.

At the instant of exposure, the mirror flies upward, the shutter opens, closes and the mirror snaps back down. It is a incredible feat, when you consider that instant return mirrors have to flip up and back in a heartbeat, over and over for the life of the camera.

Once the instant return mirror was perfected, photographers could once again design their images by looking through the lens. Unlike the twin lens reflex, this new breed of camera needed only one lens to focus and shoot with. So they became known as… you guessed it…. Single-Lens Reflex cameras.

Digital SLRs work exactly the same way — the same reflex system of mirrors and prism is used in front of a a digital sensor instead of film.

For further reading:

Wikipedia SLR page>

How Stuff Works – Single Lens Reflex

Images on this page published under the GNU Free Documentation License.

SLR Cutaway derived from image provided by:
Juhanson

Rolleiflex Twin Lens Reflex provided by
Jean-Jacques MILAN/Photographie – 40

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Who is that guy?


Web designer and photographer Tom Bonner has three decades of experience with Minolta camera equipment

Hi. I'm Tom Bonner and I am the author of the Sony Alpha DSLR-A300/A350 Digital Field Guide, published by Wiley Publishing. I've been shooting with Minolta SLRs for over three decades.

Alphatracks is my attempt to follow Sony's maneuvers in the dSLR market, and at the same time provide a resource for Minolta film and digital SLR users. A-mount shooters have to watch each other's backs, because there aren't as many of us. At least not yet....


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