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08-19-2011, 05:13 PM   #1
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Pentax D-100 lens help

I just recently purchased this lens after much research. It's supposed to be compatible with my camera, however I'm having an issue. The lens fits perfectly, clicks in place, manual focus works beautifully, the autofocus does not work. This is actually the second lens I got from B & H because when I got the first one it did this too and I thought it was defective. Now I'm wondering if they are not compatible or if I'm doing something wrong. Please help!

Sigma 18-50mm f/2.8-4.5 DC OS HSM Zoom For Pentax 861109 B&H

08-19-2011, 05:21 PM   #2
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The K100D doesn't support SDM (HSM on Sigma lenses) autofocus. You'll want to upgrade to a K100D super, or to a K-r (that would probably be easiest).

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08-19-2011, 06:35 PM   #3
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So is there nothing I can do to make this work? I was really looking forward to a lens with lower aperture.
08-19-2011, 06:47 PM   #4
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Unfortunately not. The screwdrive autofocus mechanism is not buit into the Sigma HSM lens, so it will not work on your current camera. Good reason to upgrade your camera to a K-x or K-r.

08-19-2011, 06:51 PM   #5
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Bummer! Can anyone recommend a lens that would be compatible with lower aperture, zoom, and autofocus?
08-19-2011, 07:29 PM   #6
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Any of the DA type of Pentax lenses, and a lot of other brands make compatible lens - just avoid "SDM" and "HSM" and other lenses with reference to a silent focusing motor.

You can check out the Lens Database in the "Lenses" link at the top of this page.

You might find an older Sigma 17-70 or Sigma 18-50 in the Marketplace, or make a Wanted post.

Last edited by SpecialK; 08-19-2011 at 07:35 PM.
08-24-2011, 07:40 PM   #7
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I think the Tamron 17-50mm for Pentax has screw drive, but I'm not sure. Many people here own that lens and I'm sure they'll reply.

Paul
08-26-2011, 07:20 AM   #8
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Thanks! Is this the lens you were talking about? Does anyone know if it is compatible??? Oh and I'm not sure why I wrote D-100 when my camera is a k100.

Tamron 17-50mm f/2.8 XR Di-II LD Aspherical [IF] AF016P-700 B&H

08-26-2011, 08:18 PM   #9
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Sorry, I have a K100 but not that lens. If you can't find the info with a search, post a question in the lens forum and someone can confirm/deny if it has screw drive. That is the lens I was thinking of.

Paul
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