Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
08-29-2015, 10:59 AM   #1
New Member

Join Date: Jun 2015
Posts: 2
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
Paul the Sunman's Avatar

Join Date: Aug 2011
Location: Melbourne
Photos: Gallery
Posts: 1,262
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
Site Webmaster
Adam's Avatar

Join Date: Sep 2006
Location: Arizona
Photos: Gallery | Albums
Posts: 43,030
Try cleaning the contacts. Is the camera showing "MF" on the rear LCD?

Adam Webmaster (Site Usage Guide | Site Help | My Photography)'s high server and development costs are user-supported. You can help cover those costs by donating. Or, buy your photo gear from our affiliates, Adorama, B&H Photo, or Topaz Labs, and get FREE Marketplace access - click here to see how! Trusted Pentax retailers:

08-29-2015, 09:52 PM   #4
Digitalis's Avatar

Join Date: Mar 2009
Location: Adelaide.
Posts: 8,792
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
Site Supporter
stevebrot's Avatar

Join Date: Mar 2007
Location: Vancouver (USA)
Photos: Gallery | Albums
Posts: 27,415
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)

08-30-2015, 04:18 PM   #6
Site Supporter

Join Date: Aug 2010
Location: Adelaide
Posts: 354
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
Site Supporter
ChipB's Avatar

Join Date: Nov 2007
Location: Austin, TX area
Photos: Gallery | Albums
Posts: 1,640
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.

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
autofocus, camera, k3ii, pentax help, photography, sigma, troubleshooting
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
New K-3 sometimes won't autofocus on start up. miltona580 Pentax K-3 9 10-14-2014 06:18 AM
16-50mm lens won't autofocus on k30, but will with other bodies Immunogirl Pentax SLR Lens Discussion 2 04-20-2014 10:20 PM
Help! Why won't f/2.8 200mm autofocus? jon404 Pentax DSLR Discussion 13 02-20-2014 03:59 PM
sigma mini-wide11 2.8 28mm won't work on my k-5 safc Pentax K-5 16 09-11-2013 01:20 PM
Sigma 70-200 2.8 HSM II + Kenko 1.5X won't autofocus? MrMuz Pentax SLR Lens Discussion 5 04-01-2009 02:59 PM

All times are GMT -7. The time now is 04:12 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]