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Old December 13th, 2013, 01:32 PM
Bart_van_der_Wolf Bart_van_der_Wolf is offline
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Join Date: Jun 2006
Location: Netherlands
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Originally Posted by Jerome Marot View Post
Well... It is relatively slow for a prime, but if the MTF are right it should be a very, very good lens.

A strange problem has been noted with this lens on the A7r, however:, but it appears to be the camera and not the lens.
Hi Jerome,

Looking at the cross-section diagram of that lens, it seems to have an exit pupil that's relatively close to the sensor plane. That will cause issues with chief rays hitting the sensor at very oblique angles, not good for CMOS devices.

What these Alpha 7 and 7r need are more retro-focus designed lenses with more distant exit pupils, not lenses that were designed for film.

If you do what you did, you'll get what you got.
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