Sony announced plans to release a new SLT camera line with the A33 and A55. Sony calls the new system Translucent Mirror Technology. A traditional DSLR uses a mirror placed in front of the camera's sensor to bounce an image up to the optical viewfinder. When the shutter is released, the mirror is pulled out of the way, cutting off the image in the viewfinder and allowing the sensor to capture light from the lens.
In place of a traditional mirror, the a55 and a33 contain a piece of optical film. This makes it possible for light to pass through the mirror to the Exmor APS HD sensor as light is simultaneously reflected up to a 15-point phase-detect AF chip. The stream of light to the sensor and the auto focus mechanism is never interrupted.
The A55 is built around a 16.2MP sensor while the A33 features a 14.2MP unit. Both feature 3.0" articulated LCDs, full HD video recording and ISO sensitivity up to 12,800, while the A55 also features built-in GPS. Priced at $749 and $649 respectively, the A55 will be available from October, while the A33 will hit the markets earlier, in September.
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