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You are here: Home / The Last Word / 24/3.4 Elmar color casts with a7R & a7RII

24/3.4 Elmar color casts with a7R & a7RII

August 12, 2015 JimK 4 Comments

In this test, the Leica 24mm f/3.4 Elmar-M ASPH proved to be one of the most difficult lens on the Sony a7R from the point of view of color casts, although the corner smear was not similarly bad.

I don’t expect the a7RII, with its Sony-regulation sensor stack, to be any better with corner smear than its predecessor, but I do expect that it, by virtue of its back-side illuminated (BSI) sensor, to be better at avoiding color casts.

So, I took this lens and made aperture series through an Expodisc at all whole f-stops. with the lens focused at infinity.

a7RII f/3.4
a7RII f/3.4
a7R f/3.4
a7R f/3.4
a7RII f/5.6
a7RII f/5.6
a7R f/5.6
a7R f/5.6
a7RII f/8
a7RII f/8
a7R f/8
a7R f/8
a7RII f/11
a7RII f/11
a7R f/11
a7R f/11
a7RII f/16
a7RII f/16
a7R f/16
a7R f/16

Just like with the 28/2.8  Elmarit-M, the new camera makes a big improvement. I still don’t know what that dark line on the right side of the a7R image is. It’s not on the disc. I’ll clean the sensor.

The Last Word

← 28/2.8 Elmarit-M color casts with a7R & a7RII 18/3.8 Super-Elmar corner smear with a7R & a7RII →

Comments

  1. CarVac says

    August 12, 2015 at 10:01 am

    Can you characterize in linear gamma the difference in vignetting between the two cameras?

    It makes me wonder if the sensor would benefit more from faster lenses than non-backside illuminated sensors.

    Reply
  2. Jack Hogan says

    August 12, 2015 at 12:58 pm

    Jim,
    Why does BSI do better at such color casts?
    Jack

    Reply
    • Jim says

      August 12, 2015 at 2:05 pm

      Light-sensitive areas closer to the surface of the chip, thus less parallax with the CFA for off-axis rays.

      Reply
  3. Jack Hogan says

    August 13, 2015 at 12:44 am

    Got it, thanks. So I guess flange distance is key? In that case, would it be dependent on the thickness of the adaptor used?

    Reply

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