Sony's SLT-A55V and SLT-A33 introduce Translucent Mirror Technology that allows simultaneous image capture and phase detection autofocus.
The use of a translucent mirror, also called a pellicle mirror, allows high-speed shooting at up to 10 fps and full HD movie capture with continuous Through The Lens (TTL) phase detect autofocus (AF).
Translucent Mirror Technology
In traditional DSLRs most of the light coming through the main camera lens is deflected to the optical viewfinder using an angled mirror. The main mirror is slightly translucent in the center allowing some light to pass through it to a secondary mirror, which reflects it to a special focusing sensor.
For image capture, the mirror is mechanically raised to allow light coming in through the main lens to fall on the image sensor. While the mirror is raised, the optical view finder is blanked and phase detection autofocus disabled.
Sony's A55V Translucent Mirror DSLR. Photo Credit: Sony
The mechanical raising and lowering of the mirror in traditional DSLRs slows image capture and disable autofocus at the time of image capture.
The pellicle mirror used in the Sony cameras splits the light into two beams, continuously directing a portion of the incoming light to a fast phase difference detection autofocus unit.
The technology does away with the motion of raising and lowering the mirror.
The absence of the moving mirror mechanism not only facilitates continuous autofocus and fast image capture, it also contributes to making the whole body size significantly compact compared to traditional DSLR cameras.
High Speed Image Capture and AF in Move Mode
Sony A33 Translucent Mirror DSLR. Photo Credit: Sony
The A55V can shoot stills upto 10 fps while the A33 shoots up to 7 fps.
In tandem with the translucent mirror, the two Sony cameras also feature a newly developed 15-point AF system that facilitates high speed image capture as well as continuous phase detect AF in movie mode.
The combination of 15-point AF system and Translucent Mirror Technology allows the A55 and A33 to be the first cameras to ever maintain continuous phase detection AF while recording Full HD AVCHD video.
With fast, precise phase detection AF continually tracking subject movement, even fast action and subjects that move quickly towards or away from the camera are easy to keep in focus.
Main Sensor
Both the cameras feature the APS-C sized - Exmor APS HD CMOS sensor
The A33 can capture stills upto 14.2 megapixel and the A55 upto 16.2 megapixels
Sony A33 Translucent Mirror DSLR. Photo Credit: Sony
Lens Mount
The cameras are compatible with all A-mount lenses.
Viewfinders
The cameras feature an eye level Electronic View Finder (EVF) with 100 percent coverage and 1.1x magnification for easy and natural framing. The EVF uses a 1.15 million dots LCD.
Thanks to their Translucent Mirror the A33 and A55 are the first interchangeable lens digital cameras to offer movie recording with the familiar eye-level shooting style - a significant advantage in fast moving and extreme lighting conditions (bright sunlight and low-light situations).
In addition to the electronic viewfinder, the A33 and A55 offer full-time live view with fast and accurate autofocus using a fully articulated 3-inch 921,600 point LCD with 100 percent coverage.
The variable angle tilt LCD is adjustable to accommodate shooting from low or high angles.
Sony a33 Translucent Mirror DSLR. Photo Credit: Sony
Other Features:
BIONZ high-speed image processing engine
Ultra-high ISO sensitivity (ISO 100-12,800)
HDMI output
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