Jupiter-8 back focusing

[Epimetheus]

My Jupiter-8 has a serious back focus problem with my Epson R-D1 and with Bessa-R as well. In the picture below I focused on the first pole:

Is there anything I can do with the lens to get it to work on R-D1? Would it work with some russian rf like Fed-2?

[Kim Coxon]

It should be possible to reshim the lens so that it focuses correctly. The J8s are relatively easy. The J3's and J9s can be a PITA. At a rough guess, someone may have relubed it and not replaced all the shims. The lens group needs to be moved forward in the mount.

Kim

[santino]

just what Kim said.

btw. Hi Kim. Glad you back and healthy