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10-09-2010, 06:29 AM   #1

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SDM failure, camera or lens?

I have one SDM lenses (17-70) which stopped autofocusing about a month ago. I tried a number of fixes (turn focus ring, clean contacts, divine intervention), no luck. What's interesting is that when that lens is mounted on the camera, "MF" appears in the viewfinder, regardless of the camera settings; replace the lens with functioning (screw drive) lens and everything is fine. My question: is this a failure in the lens, or the body (K20D) which is not recognizing an SDM lens? I can't test it with another lens or body, since I don't have access to either.

Last edited by Thomas; 10-09-2010 at 07:39 AM.
10-09-2010, 06:41 AM   #2
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The SDM complaints I've listened to have all been lens failures, not issues with the camera. Of course, anything is possible. Can you find a Pentax dealer and try other lenses/bodies?

good luck
10-10-2010, 07:32 AM   #3
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I have a 50-135 that the SDM acts up on. When I attach it to the camera (K10) the focus will not work. I found that if I leave the lens cap on and hold the shutter release button down continuously, it eventually begins focusing. Sometines I have to hold it down for a couple of minutes. Once it starts focusing it works fine. My other 2 SDM lenses both work fine.

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