Lens mounts may be changed by the user but mounting by a lens service center is recommended to ensure accurate focus scales.
Saying "Thx for help!" is not a crime. -------------------------------- Robert Niessner LAUFBILDkommission Graz / Austria -------------------------------- Blackmagic Camera Blog (German): http://laufbildkommission.wordpress.com
Read the blog in English via Google Translate: http://tinyurl.com/pjf6a3m
Well let me say, it's not my first lens that I change Backfocus via shimrings but its seems to be the first lens, which does not match at all. Usual the shimrings are just for small corrections of the focus. But with or without it's miles away from a acceptable result
It was my understanding that you are an experienced user. It just seems that with this Tokina lens there is more to it than just shimming.
Saying "Thx for help!" is not a crime. -------------------------------- Robert Niessner LAUFBILDkommission Graz / Austria -------------------------------- Blackmagic Camera Blog (German): http://laufbildkommission.wordpress.com
Read the blog in English via Google Translate: http://tinyurl.com/pjf6a3m
Can I just ask, having 0 experience with still lenses in my life, what is the rationale behind a zoom lens with less than 2:1 ratio, for filmwork? I imagine in stills it offers you some compositional refinement, for shots but surely in cine work, backfocus/parfocal precision hardly matters with such a range?