I've got an Angenieux 25-250 T3.9 in EF mount that for some strange reason is vignetting badly on a c300 MKII and an Amira in both 4K and 2K.
Last time I tested it there were no issues on the long end on a full frame (5D) nor M4/3 camera across the full focal range.
As far as I understand the EF flange distance is 44mm regardless of camera which suggests something very odd is happening with the mount. Panavision Australia fitted and tested it a while back and it *was* fine.
Has anyone experienced anything strange like this happening? In terms of my options to fix it, should I switch it back to PL?
Thanks very much for your help!