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08-24-2009, 02:28 PM   #1
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Sigma 120-400mm on K10

Want to buy a Sigma 120-400mm f/4.5-5.6 APO DG OS, used on a K10. Will AF work?

08-24-2009, 02:42 PM   #2
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Should do.
Have a look at other user reviews of this lens here:
PentaxForums.com Third-Party Pentax Lens Review Database - Sigma APO 120-400mm F4.5-5.6 DG HSM
08-24-2009, 03:06 PM   #3
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QuoteOriginally posted by wagi44 Quote
Want to buy a Sigma 120-400mm f/4.5-5.6 APO DG OS, used on a K10. Will AF work?
You have to update your firmware first though! Go to the Pentax website and search for it.
08-25-2009, 05:28 AM   #4
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QuoteOriginally posted by GLXLR Quote
You have to update your firmware first though! Go to the Pentax website and search for it.
Why????? I have a Pheonix 100-400 that auto focusis on every camera I have from istDL to K20 and none had to be updated.
Same with Sigma 50-500 BIGMA and still auto focuses just fine. jim

08-25-2009, 12:13 PM   #5
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QuoteOriginally posted by jmc7104 Quote
Why????? I have a Pheonix 100-400 that auto focusis on every camera I have from istDL to K20 and none had to be updated.
Same with Sigma 50-500 BIGMA and still auto focuses just fine. jim
Because the 120-400nn is HSM so if the K10D is using an older firmware it will need updating to be compatible (the same as SDM).

The Bigma is not HSM so does not need the firmware updated.
08-25-2009, 07:24 PM   #6
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Ooooook. Sorry did too fast a read, my bad... jim
08-26-2009, 06:07 AM   #7
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Firmware update done, it works perfectly now.
Thanks a lot for this advice.
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