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06-22-2012, 09:27 AM   #1
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K20D won't go into AF on Sigma lens

I have a good one for everyone to figure out. Last week I mouned my Sigma 18-50 onto my camera and it wouldn't go into AF mode. When I went into Liveview (which I never use) the image was jumpinig all over the place. I tried every switch combination known to man and nothing. Today I mounted my Sigma 50mm F1.4 and the exact same thing occured. I tried other Sigma lens and they work fine. I mounted both lenses onto my back-up K10D and they work fine and yes, I already reset my K20 back to factory settings and they both are still in MF only. I have no idea what the problem is but it's a little frustrating to say the least

What's up with that?

06-22-2012, 09:38 AM   #2
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have you tried the other AF lenses on the K20D, let's say Pentax 18-55mmm?
Did it work?
06-22-2012, 10:07 AM   #3
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Sure have and they work just fine.
06-22-2012, 10:11 AM   #4
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and have you tried cleaning the contacts on the lens and the body with an eraser?

06-22-2012, 10:26 AM   #5
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Yep, this kind of issue is almost always a result of dirty contacts. I'd go with a clean, dry cloth, first.
06-22-2012, 11:03 AM   #6
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Didn't do a thing. Lenses work fine on the K10 but not so much on the K20.

Last edited by Pauld; 06-22-2012 at 02:41 PM.
06-23-2012, 01:03 PM   #7
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Anyone have any ideas??
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