Sony redefines the DSLR with the Alpha SLT-A55/A33

by Trevor Tan
07:40 PM Aug 25, 2010

Sony's digital single-lens reflex (DSLR) cameras have always lacked the ability to capture videos ... until now. Sony today announced two new cameras - the Alpha SLT-A55 and the Alpha SLT-A33 - which adopt the company's new Translucent Mirror Technology (TMT) that allows for both still and motion picture recording.

Instead of the mirror box used in conventional DSLR cameras, TMT uses a fixed translucent mirror that does not need to be raised each time you press the shutter. Thus, light entering the lens can be simultaneously received by the image sensor and a separate phase-detection autofocus (AF) sensor. This allows super quick AF full high-definition (HD) movie recording via Live View and even allows you to shoot videos through the optical viewfinder. TMT also helps to shrink the size of the camera body.

The Alpha A33 and A55 look exactly the same. What's different are their specifications. The A33 has a 14.2-megapixel Exmor HD CMOS sensor while the A55's sensor count is 16.2 megapixels. The A55 can shoot up to 10 frames per second (FPS) while the A33 manages seven FPS. The A55 is heavier at 441g (body only) while the A33 weighs 433g (body only). And the A33 lacks the built-in GPS function of the A55.

Both sport a variable-angle, turn-and-twist three-inch LCD screen that allows you to shoot pictures at at any angle you fancy as well as self-portraits.

The A33 will be launched during Comex 2010 at Suntec Singapore International Convention & Exhibition Centre at $999 (body only) while the A55 will be available at the end of September, with pricing to be announced.