July 18, 2022


Sony and Minolta SLR Weblog

Minolta 4000 AF Flash on Sony Alpha dSLR

The Minolta 4000AF does not fit the hotshoe on the Sony Alpha and will require you to set the power manually. With a little creativity, however, you find the big flash produces excellent auxiliary lighting.

Don’t dump that old Minolta 4000 AF Flash. It won’t fit the hotshoe on your  Sony Alpha dSLR, but you can still put it to work.

Minolta 4000AF flash unit
Huge and powerful, the Minolta 4000AF is an excellent, low-cost flash unit for Sony Alpha shooters.

The Minolta 4000AF Flash Unit. Big, powerful, plentiful and relatively inexpensive. Too bad it cannot be used with the Sony Alpha. At least, that is what many of the authority sites tell you. Even some web sites I respect and recommend indicate the big flash doesn’t work with the Sony Alpha.

Minolta 4000AF with head set to bounce and swivel positions
The Minolta 4000AF head can be adjusted to bounce or swivel for enhanced lighting.

Fortunately for Sony Alpha shooters who are in the market for an inexpensive flash, that is a whole lot of hogwash. I have taken thousands of photos using this combination, and I’m here to tell you the Minolta 4000AF works beautifully with the Sony Alpha.

Please read this entire series carefully. The Minolta 4000AF does not fit the hotshoe on the Sony Alpha and will require you to set the power manually. With a little creativity, however, you find the big flash produces excellent auxiliary lighting.

You don’t need a dedicated flash unit

Minolta 4000AF Flash
at a Glance

Introduced: 1985
Weight: 1lb 5oz (with batteries)
Guide Number: 131ft / 40mtr (at 50mm zoom position)
Power: 4 AA Cells | Powergrip | AC Input

The Good

  • Powerful
  • Manual Power Settings
  • Power Zoom Head
  • Good Battery Life
  • Sony Flash Connector
  • Bounce and Swivel capabilities

The Bad

  • Bulky and heavy
  • No TTL Flash with Sony Alpha
  • Older International Hot Shoe Foot
  • Sony/Minolta Wireless Flash Not Supported
  • Separate Wide Angle Defuser Panel
  • Power Setting Difficult to Read

First off, let me define what I mean when I say this flash works. If your idea of working includes a fully automatic TTL (through-the-lens metering) experience, with exposure controlled by the camera, then the 4000AF does not work with the Alpha. On the other hand, if your definition of working means a flash unit that will sync with the camera and features manually adjustable power settings, then the 4000AF can be everything you want.

Zoom head position on the 4000AF
Power zoom adjusts from 70mm (top) to 28mm. An accessory panel increases wide angle coverage to 24mm on a full frame sensor.

Before you get too hung up on the lack of through-the-lens capabilities, you need to realize that many of the top advertising photos you see are photographed with studio strobe lights. Few, if any studio photographers attempt to use TTL control. Instead the photographer is responsible for setting the power and location the lights. If expert photographers can create award-winning magazine covers and advertising spreads without resorting to dedicated TTL metering, what’s stopping you and me? When you realize that you can pickup good 4000AF flash units for well under $50, the idea of needing a TTL Flash becomes even less compelling.

I can hear the complaints already. “…manually setting my flash is hard. And I don’t own a flash meter…”

In actuality it is fairly simple to set up an adjustable power flash like the 4000AF. And while you might not realize it, that LCD on the back of your Sony Alpha can serve as a pretty accurate flash meter.

The Minolta 4000AF Flash: A Closer Look

Let’s take a closer look at the 4000AF. When Minolta introduced the all new Maxxum cameras in 1985, they also introduced several new accessories, including a powerful new flash unit. I assume the AF tag indicates this flash was designed for the new for 1985 Minolta Auto Focus SLRs. The 4000AF remained Minolta’s flagship flash unit for years, which means you can find good, usable copies on eBay, Craig’s List, garage sales and used camera outlets. There are even suppliers who sell used Minolta 4000 AF flash units on the Amazon Marketplace.

The 4000AF and Trigger Voltage

Minolta 4000AF lower half
Bottom of the 4000AF showing the old style hot shoe foot, power port for the control grip/AC Adapter and the built-in Sony/Minolta flash connector.

One major consideration when attempting to match old film flash units with modern dSLRs is trigger voltage. In older, mechanical cameras, there were no electronics or integrated circuits, so flash designers were free to utilize very high trigger voltages. Some older flash units have trigger voltages that exceed 600 volts! I would not want to use one of these units anywhere near an electronic camera.

Newer flash units usually utilize much lower trigger voltages in order to avoid damage to the electronic circuitry in modern cameras.

As far as I know, Sony has not published the recommended maximum trigger voltage for the Alpha line, but many camera  technicians recommend keeping electronic flash trigger voltages under 6 volts for digital cameras.

AA batteries in the Minolta 4000AF Flash
Standard 4000AF power is 4 AA batteries (I use NIMH rechargeables with no problem). Flash can also be powered by control grip or AC adapter.

Originally, I worried that the huge 4000AF flash might have a high trigger voltage. I was pleasantly surprised to read on the Botzilla Trigger Voltage Comparison site that the 4000AF only has a Trigger Voltage of 1.85-2.5 volts – among the lowest I have seen. I have never tried to measure the voltage of any of my 4000AF units, but having used multiple 4000AFs on the Sony Alpha for several years without a problem, I trust that the Botzilla site is accurate. Of course your mileage could vary, so you are advised to check your flash according to the instructions on the Botzilla site. I believe the 4000AF is safe to use with the Alpha, but determining if a flash unit is safe for your camera is your responsibility.

Minolta 4000AF Features

Although it is big and heavy, the 4000AF has most of the features you might expect from a top of the line flash.

The head tilts from zero to ninety degrees, and can swivel 90 degrees to the right or left. Many newer flashes can swivel as much as 180 degrees, allowing the photographer to point the head backwards. You cannot rotate the head backwards on the 4000AF, but the way I use the 4000AF this really doesn’t matter.

Control panel on the Minolta 4000AF flash unit
Controls are laid out neatly on the back of the 4000AF. The light button illuminates the LCD panel. Zoom and Level adjust the Zoom and Power Level respectively, while the TTL/M switch changes from TTL and Manual modes. Red lightning bolt indicates the flash is ready to fire.

The flash has a power zoom head which can beam the light according to the lens being used. The zoom head adjusts from 28-70mm. If you use a telephoto lens, the ability to zoom the flash head is great feature. Used with an A-mount lens on the Sony Alpha, the 4000AF will automatically zoom the flash head according to the focal length of the lens. The zoom can be manually controlled as well, allowing you to adjust the flash zoom range for the conditions.

To cover a wide-angle lens, the photographer needs to snap a plastic defuser over the flash head. This is less convenient than with most modern flash units, which generally incorporate the defuser with an onboard, flip-up arrangement. Since the defuser is a separate piece on the 4000AF, the defuser panel is easy to misplace. In addition, there is a good chance you might not have it with you when you need it.

LCD on Minolta 4000AF flash showing power adjustment
Although the Minolta 4000AF offers manual power adjustment, the power indicator is hard to see in dim light. Marking the selected power output with thin brackets wasn't one of Minolta's better ideas.

With a guide number of 131 feet (45 meters), the 4000AF is quite powerful. The flash does not boast High Speed Sync or ADI capability, but that power and inexpensive price tag helps make up for any lack of features.

Sadly, the 4000AF came out before Minolta developed their wireless flash system, so it is not compatible with the Sony wireless optical flash trigger.

When you study the 4000AF, one of the first things you’ll notice is that the foot is not compatible with the Minolta/Sony hot shoe. The early Maxxum cameras used the standard slip on hot shoe design, so obviously the 4000AF is designed with a slip on foot.

Who Cares About the Hot Shoe?

4000AF compared with the Sony FLV42AM Flash.
Standard hot foot on 4000AF (left) compared with the Sony FLV42AM Flash Unit. Note the different hot shoe design.

The Alpha hot shoe uses the newer Minolta design, which means you cannot use the 4000AF in the hot shoe of a Sony Alpha. Is that a problem? Only if you insist on using your flash in the hot shoe, when every serious photographer on the face of the planet recommends off-camera flash. Firing your flash from the hot shoe gives you flat light, increases red-eye and  generally results in boring photographs. Don’t believe me? Search the web for off-camera-flash and see how many famous photographers advise against shooting with a flash in the hot shoe.

If you are not going to shoot from the hot shoe, it really doesn’t matter whether your flash is compatible with your flash shoe or not. What does matter is that you have a way to sync (fire) the flash at the proper time.

So how do we do that? That will be the subject of my next post.

This is the first post in a multi-part series which explains how to use the Minolta 4000AF Flash Unit on the Sony Alpha.

Minolta 4000AF on Amazon Marketplace
Current Minolta 4000AF Auctions on ebay