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You are here: Home / The Last Word / Leica M240 color shifts vs ISO

Leica M240 color shifts vs ISO

September 11, 2013 JimK Leave a Comment

Some have said that the M240 exhibits color shifts with in-camera ISO setting changes. Before I try to track down he details of the green shadow shift under pushing, I thought I should check the unpushed shifts out.

I made a series of ETTR exposures of the Classic X-Rite Color Checker at one-stop intervals to compensate for in-camera ISO changes from ISO 200 through ISO 6400. The lighting was window light on a foggy day. I picked a constant custom color balance for the whole series. I exported from Lightroom in 16-bit ProPhoto RGB. I measured the CIEL*a*b* values of the bottom row (the grey squares) in Photoshop cc 14.1.

Here’s what I got. A little shift across the squares, which could be lighting, but no shift with ISO setting:

Patch 19 L* a* b*
200 93 0 1
400 94 0 1
800 95 0 1
1600 95 1 1
3200 95 1 1
6400 95 1 1
Patch 20 L* a* b*
200 89 0 1
400 90 0 1
800 91 1 1
1600 91 1 0
3200 91 1 1
6400 92 1 0
Patch 21 L* a* b*
200 80 0 0
400 82 1 0
800 84 1 0
1600 84 1 0
3200 85 1 0
6400 85 1 0
Patch 22 L* a* b*
200 62 1 1
400 64 1 1
800 66 2 1
1600 67 2 0
3200 67 2 0
6400 69 2 0
Patch 23 L* a* b*
200 39 1 0
400 41 2 -1
800 44 2 -1
1600 42 2 -1
3200 45 2 -1
6400 47 2 -1
Patch 24 L* a* b*
200 22 3 -3
400 21 3 -2
800 20 4 -2
1600 19 3 -2
3200 18 3 -2
6400 16 3 -1

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