The new SLT-A77 is the long-awaited successor to Sony's A700 enthusiast APS-C DSLR. In 2010, Sony introduced the first cameras with TMT (translucent mirror technology), the entry-level SLT-A55 and SLT-A33. A DSLR with a TMT system has a fixed mirror that transmits most of the light to the image sensor while simultaneously directing a portion of the light to the camera's phase-detection AF sensor.
Conventional DSLRs must alternate focusing and exposing, since the SLR mirror must be down for the former and up for the latter. TMT allows the camera to continuously autofocus and calculate exposure at the same time. This speeds up operation, minimizes moving parts and provides continuous quick phase-detection autofocusing for still and HD video shooting.
Sony A-Mount Lenses
Like all Sony DSLR and SLT cameras, the A77 can use the full line of Sony A-mount lenses, as well as legacy Minolta Maxxum lenses. Sony currently offers around 30 lenses, from a 16mm ƒ/2.8 fisheye and an 11-18mm superwide zoom to a 70-400mm telezoom, including true macro lenses.
A built-in GPS makes it easy to geotag your shots, no extra equipment needed.
New 24.3 MP APS-C Sensor
The A77 features a new 24.3-megapixel APS-C Sony Exmor HD CMOS sensor—24.3 megapixels is a third more pixels than any previous APS-C sensor. The new sensor and BIONZ processer provide improved low-light performance, with ISO settings up to 16,000.
12 fps At Full Resolution The A77 can shoot its 24.3-megapixel images at 12 fps, with continuous phase-detection AF for each shot—great news for wildlife and sports-action shooters, in particular.
Rugged, Weather-Resistant Body
The body has a rugged structure of magnesium alloy, aluminum alloy, stainless steel and engineered plastic. The A77 is well sealed against weather and dust, as are its optional vertical grip, the HVL-F43AM flash unit and the new DT 16-50mm ƒ/2.87 SSM lens.
Image Sensor: 24.3-megapixel (effective) Exmor APS HD CMOS (APS-C size) Lens Mount: Sony A-mount Image Stabilization: Sensor-shift, Super SteadyShot LCD Monitor: 3.0-inch, 921,600-dot TFT Viewfinder: 1.3cm XGA OLED Video: 1920x1080/60p and 24p, 24 Mb/s; MP4 1440x1080/30p, 12 Mb/s; 640x480/30p, 3 Mb/s AF System: 19-point, 11 cross-type Shutter Speeds: 1/8000 to 30 sec., X-sync up to 1⁄250 sec. Flash: Built-in auto pop-up, GN 12 (meters, ISO 100); wireless control ISO Settings: 100-16,000, ISO 50 Continuous Firing Mode: 12 fps Metering: 1200-zone evaluative, CW, spot Storage Medium: SD, SDHC, SDXC, MS PRO Duo, MS PRO-HG Duo Recording Format: JPEG, RAW, RAW + JPEG Dimensions: 5.6x4.1x3.2 inches (body) Weight: 23.0 ounces Estimated Street Price: $1,399 Contact: Sony, www.sonystyle.com