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12-18-2015, 01:54 PM   #1
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Sigma 10-20 f3.5 HSM live view focusing problem

Hi everyone!
I've got a used copy of Sigma 10-20 f3.5 HSM lens on Ebay. Just after receiving the box, I've started to test it for proper operation on my K-5II. With the PDAF everything works fast and accurate even with a lack of light. Then I've switched to live view, and it doesn't even try to focus properly. Auto-focus goes back and forth couple of times (not fully, just within 20-30% of the focusing range) and never confirms. The same happens on my wife's K-01. Both cameras have the latest software. Have someone also experienced similar problems? I'm trying to understand, whether this is a known issue or my copy is damaged?

12-18-2015, 02:02 PM   #2
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That's weird...
I thought liveview AF was more accurate and works better in low light - but is a lot slower.
Do both cameras live view AF fine with your other lenses?
12-18-2015, 02:06 PM - 1 Like   #3

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Make sure the lens contacts are clean. But really, it's the camera that performs the CDAF.
12-18-2015, 02:56 PM - 1 Like   #4
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Some Sigma HSM lenses can have issues with CDAF. For example, the 8-16 had to have a firmware update to work properly with the Nikon d5300 in Live View. If you search you'll find some threads on the subject. Luckily the 10-20 is easy to set to hyperfocal (if that's what you want).

12-18-2015, 03:34 PM   #5
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I figured it was fixed by the newer lenses, but as krazykat said, there are issues with Sigma and CDAF. My 70-200 HSM II just bounces back and forth on live view and won't lock focus at all on my k3. Sigma said I could send it in for a firmware flash because the issue has been fixed, but that's a sports and headshot lens for me that I never use for tripod work anyway, so no need.

Since your 10-20 would likely be exclusively landscape, I see where cdaf would be useful. Call Sigma. Best I recall, you only have to pay shipping both ways for the fix.
12-18-2015, 04:00 PM   #6
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Get a firmware update if one is available or only use manual focus in liveview with it.
12-18-2015, 07:04 PM   #7

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Don't you need the SIGMA USB Dock to update firmware?
12-18-2015, 09:29 PM   #8
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Interesting. My 10-20 f3.5 focusses Ok in Liveview.
However the Tamron 70-200 f2.8 is known for having focus problems in liveview (mine does).

12-19-2015, 04:55 AM   #9
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Original Poster
Thanks to everyone for the replies! Checked today again in the daylight - the same story on both cameras - flounce back and forth within a small range, no lock. PDAF focuses accurately.... I experienced no problems with any of my lenses in the live view before (except of sigma 100-300 when used with sigma 1.4x converter). Will contact Sigma after the Christmas holidays!
12-19-2015, 05:05 AM   #10
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QuoteOriginally posted by fb_penpho Quote
Get a firmware update if one is available or only use manual focus in liveview with it.
What he said. This should be done free of charge by the SIgma distributor in your area.

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10-20, auto-focus, copy, f3.5, f3.5 hsm, focusing, hsm, hsm live view, k-5ii, k-mount, pentax lens, problem, sigma, sigma 10-20 f3.5, slr lens, view
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