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03-29-2009, 10:15 AM   #1
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Join Date: Sep 2008
Location: Connecticut
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K100D AF problem

Lately, my K100D has had a problem engaging two of my AF lenses. Primarily the kit lens, and less often with the Sigma 28-80.

The motor sounds like it is searching for the lens. I can sometimes fix it by removing the lens, and then remounting it on the body. Of course, this only happens when I am rushed to catch a time-sensitive shot.

Once it finds the lens, the focus is fine.

Any suggestions? Should I take it to Pentax for repair? The camera is outside of the warranty period.

03-29-2009, 10:47 AM   #2
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Andi Lo's Avatar

Join Date: Jul 2008
Location: Halifax, Nova Scotia
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Did you check the AF-MF switch on the mount? Remove the lens then switch the AF-MF back and forth. The AF motor should pop in and out. I suspect that the AF key might be a little loose. Happened once to me but i couldn't fix it by mounting / remounting. Playing with the AF switch with no lens on it fixes mine though. Hopefully you can determine the problem this way.
03-30-2009, 10:14 AM   #3
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Location: Connecticut
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Original Poster
Thanks for the suggestion. The AF drive does pop out when I move the switch. I guess I will have to wait and see if the problem occurs again.

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