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04-15-2012, 08:04 PM   #1

sigma 150 - 500 not Auto focusing

Hi Does anyone have an answer to this issue. Took delivery of a Sigma 150 -500 APO DG OS HSM this morning and have just found that it will not auto focus on my my Pentax DS camera. the camera is about 8 years old but the firmware has been updated to yhe latest 2.02 version. I can use it manually but would prefer to use the auto function. Can anyone help?

04-15-2012, 08:15 PM   #2
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The DS does not support HSM (or in Pentax speak - SDM) focusing - auto-focus on it will only work with the screw-drive AF lenses.
04-15-2012, 08:39 PM   #3
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Yup, unfortunately. You will need a K100D Super (or newer) for the HSM to work. Any current DSLR/K-mount mirrorless supports it.

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04-15-2012, 09:08 PM   #4

sigma 150 - 500 not Auto focusing

Thanks for your help guys - It was greatly appreciated.


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