Lab test results (Provided by DxOMark):
Maximum ISO for acceptable image quality (digital noise): 800
Maximum ISO for acceptable dynamic range: 1600
Color depth: Excellent (24 bits)
Overall image quality: Very good (78 out of 100)
Dynamic range: Excellent (13.2 stops)
The Sony Alpha DSLR SLT A77 offered an excellent performance. Signal to noise ratio remains stays within acceptable limits through ISO 800 but could be stretched to 3200 in a pinch. The dynamic range is a key strength, allowing a range of 13.2 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: The Sony A77 may be the senior member of the enthusiast-level DSLR gang, but it has aged well. When it was introduced in 2011, the A77 was touted as the fastest DSLR in the world. That’s because, technically, it’s not fully a DSLR; it has a fixed translucent mirror that projects the image into a separate sensor which in turn, displays the image in the highest-resolution EVF available today. This is the direction Sony’s been going in ever since, but with its still state-of-the-art 24MP APS sensor and 12fps burst rate at full resolution, the Sony A77 is still a technological leader while its price keeps dropping.
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.