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02-18-2008, 06:40 PM   #1
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Join Date: Aug 2007
Location: Massachusetts
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Sigma 17-70mm Apeture Issue

I'm having some problems with my Sigma 17-70mm lens. I have had the lens on my K100D for the last 6 months and it worked fine up until about one or two weeks ago. It used to stop open to f/2.8 just fine and now it will only open up to f/3.5. If I giggle it or keep scrolling on the wheel it will go to f/2.8 but then it goes back to f/3.5.

I haven't dropped the lens or camera and their doesn't appear to be any goo at the lens-body junction.

Has anyone had similar problems? Is there anything I should try?



02-18-2008, 06:49 PM   #2
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Join Date: Dec 2006
Location: North of Boston, MA
Posts: 798
Never had that problem with mine even after a month of traveling through Alaska, not that I beat on it but it wasn't the easiest month for camera gear. I probably took about 2000 shots with that lens in the month with not one problem.


Oh I know a dumb question but you are sure that it is had 17mm and not zoomed in a at all right?
02-18-2008, 08:01 PM   #3
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My 17-70 either had the same problem when I first got it or developed it very soon thereafter. Just like yours, it would open up no wider than 3.5. I sent it back to the Sigma repair station in New York State, and they repaired it free of charge as it was still under warranty. I've had no problems with it since.


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17-70mm, f/2.8, f/3.5, k-mount, lens, pentax lens, sigma, slr lens
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