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08-29-2015, 10:59 AM   #1
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Sigma 8-16 won't autofocus on K3ii

Just got my K3ii, love it but my Sigma 8-16 won't autofocus on it. Anyone else running into this issue? Any ideas on what one might do?

- Peace

08-29-2015, 12:36 PM   #2
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Are you using spot or zone focus? Have you cleaned all contacts?

I don't own the 8-16, but it's long been on my "of interest" list, so I'm keen to see if this is a common problem.
08-29-2015, 02:54 PM   #3
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Try cleaning the contacts. Is the camera showing "MF" on the rear LCD?

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08-29-2015, 09:52 PM   #4
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QuoteOriginally posted by djking Quote
ust got my K3ii, love it but my Sigma 8-16 won't autofocus on it.
Remember the AF switch on the side of the lens has to be on AF, as well as the camera AF mode switch. Though I often use my 8-16mm on MF mode with the camera in AF mode - you so rarely have to change focus on that lens I think the HSM motor in the 8-16mm to be rather superfluous.

08-30-2015, 01:41 PM   #5
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QuoteOriginally posted by djking Quote
my Sigma 8-16 won't autofocus on it.
Does not try? (AF turned off or lens is not detected as AF...MF in rear LCD)

-- or --

Tries, but cannot attain focus (no green hexagon...subject has inadequate detail or contrast)

-- or --

Tries, but only using the AF button on the back (AF button configuration, AF2)


Steve
08-30-2015, 04:18 PM   #6
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Also, are you using CDAF (Live View)? Some Sigma lenses with HSM have issues with Pentax CDAF (and Nikon CDAF too).
08-31-2015, 10:04 AM   #7
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QuoteOriginally posted by djking Quote
Just got my K3ii, love it but my Sigma 8-16 won't autofocus on it. Anyone else running into this issue? Any ideas on what one might do?

- Peace

Did the Sigma autofocus on a different Pentax camera? That will help figure out where the problem is.
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