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08-31-2010, 06:05 PM   #1
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Sigma 10-20mm f4-5.6 EX DC color fringing

Not sure if this is the right spot for this; if not, moderators please move.

I just purchased the above lens (mail order) and shot just a few test pics. I see definite color fringing that is more than I think appropriate. I see green on the left and red on the right side of high contrast edges. If I were to put on 3D glasses...

Is what I'm seeing in the attached pics typical or did I get a bad copy? I've included both a tight crop and a sized-down version of the original. Thanks in advance for any input.


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09-01-2010, 02:18 AM   #2
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From the reviews it appears that the ca control is quite good: Sigma 10-20mm F4-5.6 EX DC HSM (AF Lens) Lens Reviews - Pentax Third-Party Lens Review Database

However, with any lens that wide I wouldn't be discouraged by CA near overexposed edges- that's just diffraction in action .
09-01-2010, 02:35 AM   #3
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That's exactly true. Ultra wides exhibit this much more than most other lenses. The DA10-17mm fisheye shows it even more. I don't think you have a bad copy. I've owned this lens, the Sigma 12-24mm as well as the DA12-24mm and all show this to some degree, Although the DA controls fringing better than the others.
09-01-2010, 04:33 AM   #4
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the color fringing is actually latteral CA, where purple is on one side and green on the other, in out of focus regions.

I have not seen this on my copy, but that does not mean it isnot there.

I have been very pleased overall with my copy of this lens, which I have had now for 5 years

09-01-2010, 04:41 AM   #5
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This is normal for the Sigma 10-20 in high contrast lighting which is worst at the edges. It's easily corrected if you shoot RAW.
09-01-2010, 05:52 AM   #6
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Thanks, Ndever had anything quite this wide before. Wasn't sure if what I'm seeing was typical or not.

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