Lab test results (Provided by DxOMark):
Maximum ISO for acceptable image quality (digital noise): 1000
Maximum ISO for acceptable dynamic range: 1600
Color depth: Excellent (24.4 bits)
Overall image quality: Excellent (82 out of 100)
Dynamic range: Excellent (13.4 stops)
The Sony Alpha DSLR SLT A77 II offered an excellent performance. Signal to noise ratio remains stays within acceptable limits through ISO 1000 but could be stretched to 3200 in a pinch. The dynamic range is a key strength, allowing a range of 13.4 stops at ISO 100, and stays well within toleranes through ISO 800. Measured ISO consistently remained about 1/3 stop below the indicated speed.
Overview: Boasting the world's fast continuous shooting speed (up to 12fps at full resolution), the Sony A77 II takes full advantage of its fixed-position translucent mirror that projects thte image onto a separate sensor which, in turn, displays the image onto a 2.359 million pixel EVF, the highest resolution EVF currently available. The 79-point phase detection AF system (which includes 15 cross-type points) can reliably track moving objects and is considered one of the fastest-focusing systems on the market. All this and more in a ruggedized magnesium alloy body.
The system: Over 30 lenses (many produced for Sony under the Carl Zeiss moniker) an impressive wireless flash system, and all those great legacy Minolta optics.
Going pro: The full-frame Sony SLT-A99V, at the Adorama price of $2,798, uses the same kind of fixed, translucent mirror system as the A77; the live image is displayed on a 2 million-plus dots resolution electronic viewfinder that lives in the former penta prism housing. This allows Sony to do all sorts of neat tricks, mostly due to the fastest burst rate and uncompromised video files in this camera class. A dual AF system is said to be incredibly fast and accurate, and the 24.3MP 35mm sensor, with its native ISO range of 100-32,000, is one of the best.