Nex-6 and nex-7 EVF inferior to A99 EVF when it is supposed to be the same?

Started Dec 15, 2012 | Discussions thread
Bart Hickman
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Re: Yes, you are confusing things ...
In reply to blue_skies, Dec 16, 2012

blue_skies wrote:

Bart Hickman wrote:

blue_skies wrote:

Read:

http://forums.dpreview.com/forums/post/50474955

All you are noticing is the higher light sensitivity of the FF sensor, and the Wide Open viewing mode of the A99, probably with a faster lens. The EVFs are identical.

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Cheers,
Henry

From what the O.P. said (that even the V1 looks smoother and lacks moire), the difference almost certainly comes down to filtering (anti-aliasing) of the EVF image which will avoid the moire problem and significantly reduce noise at the same time. The V1 can afford to filter because the image sizes involved are much lower. The A99 can afford to filter because it has a bigger batter and probably more beefy processing. Having the same EVF hardware is not everything.

Bart

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The V1 has a lower ISO sensor and has 1.4M pixels versus 2.4M pixels in the Sony's.

The view in the Sony matches that closely to a FF OVF. Both in apparent size (to the eye) and in placement of the screen and diopter. Quite a few prefer the V1's slightly different interpretation hereof, feeling less viewfinder like.

The Sony EVF refreshes at 60times a second (if I remember correctly, to avoid flickering) and displays what the sensor sees. If you use shutter times longer than 1/60th, the EVF uses gain-up to compensates for the loss of exposure and darkening effect. Gain-up amplifies noise. As designed, the Sony shows the image as shot, including ISO. Again, the A series show a wide open aperture, whereas the Nex cameras show a stopped down aperture. This makes the EVF grainy under low light, but you see what the camera records otherwise.

The NEX-6 (which is what I have) is at 1/60s only if the shutter is at or above 1/60s.  If you go below that, the EVF and LCD update rates follow until about 1/10s or so and then it starts "gaining up" as you say.

Bart

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