Hi!
I am trying some Contax primes on my new 5D2 via the CameraQuest adapter and wonder,
how to check if they really can focus at infinity? Since the focus ring can not be turned *beyond* infinity (which nobody has promised), how do you know if the focussing is at its optimum, or the lens is at its limits? At least with the Distagon 35, I feel not convinced that it really focusses at barely 50 meters distance. (Everything further than that is in a mist right now).
It also turnes out that there is a gross focus shift when stopping down. So that the lens can be focussed to infinity at f/2.8 does not guarantee that it will at f/22.
I used live view with the 10x enlargement of course, and viewed the monitor with a pair of +4 spectacles, on top of my +3 myopia.
The lenses in question are the Distagon 35, Sonnar 85 and Sonnar 135. Only with the latter I feel reasonably sure that i really can be focussed to infinity. Swapping adapters has not changed the picture.
Would anybody know of a procedure to clarify this question?