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03-27-2016, 06:02 PM   #1
Ken Kroska
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Sigma 18-300 lens can't get auto focus to work

I bought a 18-300 lens from B and H Photo and can't get the auto focus to work, have both the lens and camera set to auto focus


Last edited by Adam; 03-27-2016 at 06:07 PM. Reason: removed email
03-27-2016, 06:08 PM   #2
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What camera are you using? Is the display showing F--? Are you shooting through the viewfinder or live view?

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03-27-2016, 07:21 PM   #3
Ken Kroska
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dang I forgot that a K100D, looking through the view finder and it some a MF in the lower left hand corner, when I put on the 18-55 it works in auto
03-27-2016, 07:23 PM   #4
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QuoteOriginally posted by Ken Kroska Quote
dang I forgot that a K100D, looking through the view finder and it some a MF in the lower left hand corner, when I put on the 18-55 it works in auto
The K100D does not support SDM and as such it will not autofocus with this 18-300mm lens.

I'd recommend upgrading to the K-50


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03-27-2016, 07:33 PM   #5
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QuoteOriginally posted by Adam Quote
The K100D does not support SDM and as such it will not autofocus with this 18-300mm lens.

I'd recommend upgrading to the K-50
Yup, you'd need something just a bit newer, at least. SDM support wasn't available until the K100D Super, K10D, K200D era.
03-27-2016, 07:38 PM   #6
Ken Kroska
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How about the K3 which would be better the K3 or the K-50 thanks I guess I should have asked here before I bought the lens
03-27-2016, 07:49 PM   #7
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The K-3 is a more advanced body. You can learn more here:
Pentax K-3 vs. Pentax K-50 - Pentax Camera Comparison - PentaxForums.com

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