Hi all,
A few days ago my K-5 stopped focusing properly to infinity with my Tokina 28-70mm AF lens. This lens has played just fine with this body up until now. I tested the issue with another lens and infinity focus was fine. I tried switching to manual focus, and when the lens was focused to infinity the camera would not confirm focus. The AF did successfully lock at short distances and with the lens in 'macro' mode, but attempting to focus on anything more than about 30-ish feet away resulted in the camera focusing out as far as possible and then displaying the blinking 'cannot obtain focus' hexagon. (i.e. there was no hunting; there was also plenty of light out.)
Fine AF adjust was initially set to -10 all, +2 this lens. I tested at -10/-10, 0/0, and +10/+10, and failed to obtain infinity focus at any combination of settings.
Is this likely to be a physical issue with the lens? I can't afford to replace this lens.
Thanks for any advice you can offer.
[edit]
I also tested the camera with one more lens, and can confirm that on 2 different lenses the infinity focus is fine. Whew.
Last edited by Sicariphus; 04-28-2013 at 11:08 AM.