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08-19-2010, 09:39 PM   #1
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Back Focus in a new Sigma 28mm lens

I just bought at the end of July a Sigma High-Speed-Wide 28mm f/1.8II. It came as new although I know it is an older model. I didn't notice the issue in my first few shots, but I now have learned that at close range it focuses behind the target by a good centimeter or 3. This seems amplified by distance, as in some mid range shots nothing is in focus but the back ground. I tried the Af adjustment on my K20d, and while that improved the matter (at +10) it still isn't back to normal.

I am outside the standard return range, is there a longer period for defective goods? Do you honor the warranty, or will Sigma? How do I access that?

Thanks very much,

Nick Siebers

08-20-2010, 06:24 AM   #2
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Sorry to hear about your lens. Another forum had asked about the 28mm f1.8 lens and I called Sigma and while they changed the lens cosmetically ( different focusing ring finish ), the lens itself has not be altered per the rep I spoke with.

Sigma can check for back focusing issues but they will need your camera. It's a minor adjustment calibrating the lens to your body. - Service & Support

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