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09-02-2008, 09:41 PM   #1
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Sigma 18-50mm F2.8 EX DC MACRO AF problems on K20D

Howdy, I am hoping someone here has solved this problem.

My recently acquired Sigma 18-50mm F2.8 EX DC MACRO focuses perfectly on my K10D but not so on the K20D. I tried adjusting AF for this lens on the K20D but so far it's still work in progress.

Would anyone happen to know if there is perhaps a firmware update for this lens? I looked on the Sigma website but no luck yet. Any advice would be much appreciated.

09-04-2008, 07:58 AM   #2
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I got this lens when I had my k100ds.

I just received my k20d last week, and I haven't had any problems at all.
09-04-2008, 08:48 AM   #3
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I ended up shipping the lens to a Sigma repair center, there was just no way to adjust it in-camera to focus correctly. It's real pity because I really like this lens. I will post an update on how it performs after the calibration.
09-04-2008, 05:44 PM   #4
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Sigma repair center has a really good rep, hopefully it's fixed soon


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18-50mm, af, dc, f2.8, f2.8 ex dc, k-mount, k20d, lens, pentax lens, sigma, sigma 18-50mm f2.8, slr lens
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