Sony a99 with and without mirror at ISO 100 and 6400 (by Maxime Siegler)

SAR reader Maxime Siegler tested the Sony A99 Image quality with and without the semitransparent mirror. yes, he removed the mirror fromx his camera :)

This exposure of “mirror, ISO 100, 6s, f/1.4” was matched to that of “mirrorless, ISO 100, 6s, f/1.4” by using the exposure slider (+0.5) in ACR >>> mirror match, ISO 100, 6s, f/1.4, +0.5
mirror, ISO 100, 6s, f/1.4
mirrorless, ISO 100, 6s, f/1.4

This exposure of “mirror, ISO 6400, 1/13s, f/1.4” was matched to that of “mirrorless, ISO 6400, 1/13s, f/1.4” by using the exposure slider (+0.5) in ACR >>> mirror match, ISO 6400, 1/3s, f/1.4, +0.5
mirror, ISO 6400, 1/13s, f/1.4
mirrorless, ISO 6400, 1/13s, f/1.4

His conclusions are that the “mirrorless” shots have:
* cleaner high ISO files, i.e., the noise pattern remains relatively smooth at ISO 6400 by ca. 1/2 stop (maybe slightly more).
* slightly more refined details.

This isn’t a suprise for none of us. We already knew there is some (negligible?) loss with the mirror. If Sony keeps developing the SLT tech I hope they will offer a mirror lockup feature on future cameras. Not impossible

A similar test made with the A55 SLT camera has been made years ago by Thesybersite.