Sigma 120-400mm on K10

wagi44 · 08-24-2009, 02:28 PM

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

Ash · 08-24-2009, 02:42 PM

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

GLXLR · 08-24-2009, 03:06 PM

Originally posted by wagi44

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.

jmc7104 · 08-25-2009, 05:28 AM

Originally posted by GLXLR

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

Mike.P® · 08-25-2009, 12:13 PM

Originally posted by jmc7104

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.

jmc7104 · 08-25-2009, 07:24 PM

Ooooook. Sorry did too fast a read, my bad... jim

wagi44 · 08-26-2009, 06:07 AM

Firmware update done, it works perfectly now.
Thanks a lot for this advice.

08-24-2009, 02:28 PM	#1
wagi44 New Member Join Date: Aug 2009 Location: close to Vienna Posts: 5	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?

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08-24-2009, 02:42 PM	#2
Ash Moderator Join Date: Mar 2007 Location: Toowoomba, Queensland Photos: Gallery \| Albums Posts: 23,914	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
GLXLR Veteran Member Join Date: Feb 2009 Location: Sugar Land, TX Photos: Gallery Posts: 684	Originally posted by wagi44 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
jmc7104 Veteran Member Join Date: Feb 2008 Location: Rock Island, Illinois 61201 Photos: Gallery Posts: 436	Originally posted by GLXLR 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
Mike.P® Pentaxian Join Date: Mar 2008 Location: New Milton, Hampshire, UK Photos: Gallery \| Albums Posts: 2,147	Originally posted by jmc7104 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
jmc7104 Veteran Member Join Date: Feb 2008 Location: Rock Island, Illinois 61201 Photos: Gallery Posts: 436	Ooooook. Sorry did too fast a read, my bad... jim

08-26-2009, 06:07 AM	#7
wagi44 New Member Join Date: Aug 2009 Location: close to Vienna Posts: 5 Original Poster	Firmware update done, it works perfectly now. Thanks a lot for this advice.

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