Sony SLT-A77 OLED viewfinder

Spec :
AMOLED
1024 x 768 XGA
100% frame coverage ( should be )
frame rate: 12 fps max

review shows that
Cons:
Sony's new OLED technology does a dramatically better job with highlights than most any EVF approach we've seen in the past, but we found that the tonal problem has now moved to the shadows: In scenes with a wide tonal range, it can be tough to see any detail in shadow areas without momentarily re-framing to get the viewfinder to gain-up a little.

Even with the brightness adjustment set to maximum, when I brought the viewfinder to my eye while shooting under bright sunlight, the EVF display was significantly less bright than the surroundings.

While great progress has been made, even the A77's OLED display doesn't come close to providing the dynamic range of a purely optical system. Likewise, update lag during continuous shooting is still at least somewhat an issue.


Pros:
One very useful improvement over optical viewfinders comes at the opposite end of the light scale, when shooting under dark conditions