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08-14-2012, 10:46 AM   #1
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Autofocus will not engage on K10 using Sigma 70-200mm f/2.8 II EX DG APO Macro HSM AF

I just picked up a Sigma 70-200mm 2.8 II APO Macro HSM and my K10 will not switch to AF mode with it attached. The lens is switched to AF and I've tried both AF.S and AF.C modes on the camera in green mode. I've also tried other camera modes. Pressing the AF button does not change the focus status. Has anyone else had a similar experience, or is this lens not compatible with the K10? Any thoughts will be greatly appreciated.

Steve

08-14-2012, 11:15 AM   #2
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You'll need to update your camera's firmware to version 1.3 (or might be 1.31, whatever the latest version is...or was). SDM (and in the sigma lens case HSM) was not initially supported when the K10d came out, the functionality was later added via firmware.

To check what firmware you've got, hold down the OK button while turning the camera on - it will be displayed on the back.
08-14-2012, 11:41 AM   #3
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That did it. Thanks pxpaulx.
08-14-2012, 01:12 PM   #4
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Awesome, have fun!

08-14-2012, 11:18 PM   #5
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There are people who love to have a K10D with the older firmware At least lenses with SDM issues still work on that because it uses the screw drive in that case.

The downside you have already experienced; SDM only lenses don't work on the older firmware
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70-200mm f/2.8 ii, af, apo macro hsm, camera, dg apo macro, ii ex dg, k10, modes, pentax help, sigma 70-200mm f/2.8
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