Originally posted by Blacknight659 Remember, on Pentax, we have an AF switch on the body, AND The Sigma / DA* lenses also have an AF switch on the lens.
If you are not getting lens motor movement at all, verify the switches are ON.
Its kind of confusing this!, having to deal with two AF switches, but to answer your question, the AF mode is on and the motor is working, however, the lens just fails to focus on the wide end, and focuses somewhat well when zoomed in @ 50mm.
---------- Post added 08-07-17 at 01:07 PM ----------
Originally posted by lytrytyr As a happy owner of a Tamron 17-50mm f/2.8,
I'm not sure that I'd consider a Sigma lens to be
the 17-50mm f/2.8!
Everyone that I talked to, recommended the Sigma over the Tamron, lol,