Hi Guys,
This is my last desperate try before sending my camera into a service to check and this focus issue annoys me so much I can't tell.
I rencently bought a used K3 II and it's seemed to be working nice. I even did a focus calibration with a test chart I printed out and I was quite relaxed that i'm going to enjoy the sharp images i'll took. Then came the first shock when I used it in real life that it seems when i focus for a far away object it has back focus but for closer objects it seemed ok. I again tried to calibrate the focus to try to find the sweet spot where it sharp at both and again I though it'll be fine.
Then I did some couple shoots and other stuff and again I was shocked how many of my photos again was not in focus. Since then I'm trying to find what's the proper focus adjustment but a lot of times it just feels random if it's sharp or not.
I've read about cleaning AF sensor can help a lot on AF and I did that also with a rocker blower, however I haven't seen any big hair or dirt on the sensor. Hard to see it tohugh I don't have such mirror that dentists are using.
My biggest fear is now that it's operates differently on each focal length and I won't able to calibrate myself properly. I have a Pentax 50mm 1.8 lens besides the Tamron and it's hard to compare the tests with it due to the different focal length but it seems to be ok after calibration.
Long storys short I have a feeling that it does front focusing in general but depends on how i calibrate if that occurs at far or close objects especially at 200mm.
I get best results for far objects if i use no af adjustment, for test chart i would say -8 - 10 working best.
Thanks if advance for usefull advises.
Regards,
Balazs