The 24 megapixel A77 becomes Sony's highest end APS-C format SLT camera. The SLT design uses a fixed translucent mirror instead of a moving mirror as in a traditional SLR design. Sony uses this arrangement to enable phase-detection autofocus, but the cameras have electronic, not optical, viewfinders, which display a video feed from the main image sensor.
The A77 has a weather and dust resistant, hybrid magnesium-alloy and polycarbonate body; a 3-inch tilt-and-pivot LCD display; a 19-point autofocus system; 50ms shutter lag; 1/250th of a second flash sync speed; in-body image stabilization; a shutter rated to 150,000 cycles; on-board GPS; and an ISO range of 50-16,000 with a special mode allowing up to ISO 25,600. Maximum burst speed is 12 frames per second with continuous tracking autofocus, according to Sony. At that speed, there is about one second's worth of buffer depth—14 JPEG or 13 RAW images.
Like the two NEX cameras, the A77 records HD video in AVCHD v2.0 format at 1080p/60fps, 1080p/24fps, 720p/30fps, and several other resolutions. At 1080p/60fps it achieves a maximum data rate of about 28 Mbps.
The A77 will ship in the U.S. in October 2011 for an estimated street price of about US$1400 body only, or for about US$2000 in a kit with the new DT 16-50mm f/2.8 lens.
Also announced for the A77 is a new vertical grip called the VG-C77AM, which can hold two batteries, doubling battery life. It's also weather resistant and will be available in October 2011 for an estimated street price of about US$300.
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