Half circle marks on 1Ds

Started Apr 15, 2004 | Discussions thread
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John Ingrouille
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Half circle marks on 1Ds
Apr 15, 2004

Hi all,

I would be interested if anyone else has had these half circle marks with Sigma 50-500 and 1Ds combination or anyother lens/camera combo for that matter, I don’t get it on any other lens nor do I get it if I put the Bigma on my canon 10D.

It seems to only happen if I under expose by about 1 to 2 stops I only notice it if I shoot against a background like a dull sky or sea and is always in the same place.

I have put a link to view two examples (click on photos to see larger), both pictures were under exposed and the b&w shot was taken with the purpose of demonstrating the problem. I have put arrows at the start and finish of the line. Both pics were taken 500mm and at 800 iso.

Many thanks,

John Ingrouille

http://ji.smugmug.com/gallery/99037/1/3488081

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