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Old Nov 1, 2005, 11:48 AM   #1
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I just got the Sigma 18-200mm lens for my 20D, and I've been happy so far with a few test shots that I've taken. I did notice that one of the inner lens seems to have a small triangular imperfection that looks like it has some extra coating or from some positioning tool. It is around the 4 o'clock position in the attached photo (that I took with the kit lens).

It doesn't seem to affect the images, but I was wondering if anyone else has come across this blemish?


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Old Nov 2, 2005, 3:54 AM   #2
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This has the same effect as dust specks on the lens which you will eventually get because of the surrounding air - They are so far out of the plane of focus that they will not be noticeable...

With enough junk on the inside it might manifest as a lost of contrast though
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Old Nov 6, 2005, 4:54 PM   #3
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I bought a brand new sigma 55-200 also and there was a nice size dust spec in the middle of the lens under the first optic, I got another one and also there is a spec but not in the middle like the first one was.
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Old Nov 6, 2005, 11:07 PM   #4
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if you go looking for dust in your lenses you will no doubt find some.. so i dont even look... :?
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