Alphatracks

June 10, 2010: Remember when Sony waited a full 18 months to introduce a new dSLR after releasing the A100? Now it seems they seldom wait more than 18 days before releasing a new model. Okay, that may be a slight exaggeration, but the Sony dSLR factory will soon be cranking out two new entry-level models: the A290 and A390.

Sony is aiming the new A-mount cameras at first time dSLR users, and the specs are similar to earlier Alpha starter dSLRs. The new cameras are obviously closely related, the principle difference being the tilting live view system on the A390.

Both cameras will use a 14.2 megapixel sensor, and they include the usual Sony Alpha feature set: Steady Shot image stabilization, Sony and Minolta A-mount lens compatibility, pop-up flash and 9-point auotfocus system.

A couple of things set the new modles apart from earlier editions. There is a new grip design, which Sony claims is more comfortable to use. in addition, both cameras include HDMI output and BRAVIA Sync, so you can view images on your big-screen television if you are so inclined.

Because Sony is targeting first time dSLR buyers with these cameras, both models include Sony’s on-screen Help Guide and Graphic Display program.

The tilting live-view follows the design first offered in the A350 and A300.

Sony of Europe has announced that the A290 and A390 will be available in Summer 2010. Will the new cameras be sold in the United States? So far, there is no mention of the new cameras on Sony’s US web site. The Sony A450, profiled here some months back, has been on the market for several months…but it is not sold in the US.

Will Sony offer the A290/A390 in the USA? Or do they have something else in mind?

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One of the most intriguing things about the Sony Alpha NEX-5 and NEX-3 cameras is that you can use your existing A-mount lenses on the new models. Well, sort of. You need the Sony LA-EA1 adapter to mount an A-mount lens on the NEX system, and that involves some minor sacrifices. Overall, however, your current lenses should deliver great images on the NEX system.

The LA-EA1 is a far cry from the simple adapters used to mount non A-mount lenses on the Sony Alpha. It differs from the typical simple machined ring found in  MC to A-mount adapters or M-42 lens conversion mounts. The A-mount to NEX adapter is a sophisticated piece of electronics.

Unlike Minolta Rokkor or M-42 lenses, A-mount lenses from Sony and Minolta do not have an aperture adjusting ring, Older style lenses have a mechanical ring that allows the user to change the aperture opening manually. When Minolta introduced the Maxxum cameras in 1985, however, they did away with the aperture ring and used electronics inside the camera to regulate the aperture. If desired, the photographer could still manipulate the aperture manually, but it had to be done through a menu on the camera body.

This makes a conversion adapter for A-mount lenses more challenging to design. Conventional adapters rely on the user manually setting the aperture. Since there is no external method for changing the aperture on an A-mount lens, any useful adapter needs to provide a way for the camera to actually control the lens electronically.

Admittedly, it isn’t difficult to pass electrical information through an adapter. but the adapter needs to be designed so the camera’s aperture control can control the lens.

The LA-EA1 can do just that, providing automatic — and presumably manual — control of the lens from the camera’s  controls. Since the auto-diaphragm on the A-mount lenses is also controlled electronically, the new adapter will provide auto-diaphragm capability as well.

What the adapter will not provide, however is auto-focusing. The overwhelming majority of A-mount lenses do not have internal focusing motors, so the adapter is not designed to offer auto-focus.

The other limitation is image stabilization. Sony Alpha dSLRs are famous for having image stabilization built into the body. In order to make the NEX bodies as small as possible, however, Sony engineered the small cameras to use in-lens stabilization. As a result, A-mount lenses mounted to the NEX series cameras will not have stabilization.

One other interesting feature of the adapter is the built-in tripod collar. The NEX series cameras are so small that there might be problems using a heavy lens on the camera while it is on a tripod. Sony eliminated the problem by incorporating a standard tripod mount within the adapter. You merely hang the camera body on the adapter, while all the weight of the lens is borne by the adapter.

The LA-EA1 is available for pre-order at Sony Style for $199.00.

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