Originally posted by ogl Some comparisions
I really don't like misleading comparisons ...
The A-77 has a translucent mirror eating about 1/3 of light according to DxO tests for the A580 vs. SLT A35.
This means that the A77's ISO 1600 really is ISO 2400 for normal cameras (if one wants to compare the sensor...).
Then, Sony underperforms with the same sensor, compared to Pentax and Nikon, as the comparison of the A580 vs K-5 or D7000 shows.
Finally, images must be scaled to match one size.
In the following comparison, I did the necessary work in order not to jump to conclusions like anybody else.
It is all images scaled to 8MP, and A-77 ISO 1600 compared to ISO 3200 from models w/o a translucent mirror. ISO 2400 isn't available in the comparisons.
As you can see, the A-77 and A580 perform almost the same and I see no reason to assume that the sensor embedded in the A-77 has worse low light or dynamic range performance than its 16MP predecessor.