Komura 35mm lens is back focusing...

[stompyq]

I recently bought a Komura 35mm 2.8 lens from the auction site. Unfortunately it backfocuses badly on my M6🙁. I've wondered about getting rid of it but don't want to cheat the next guy who gets it. It's just been sitting on my desk and for a few months now and I've finally accepted that i should try to get it fixed. Any recommendations about where to send it and how much it would cost? I'am guessing theirs nothing i can do to get it to work right?
I contacted Youxin and he said he can't help me..

 

[ItsReallyDarren]

Sounds like the lens needs to be reset on a collimator. Try one of the repair places or people like Essex or Dag.

 

[johannielscom]

you're not too far away from Brian Sweeney, he might consider helping you out when it comes to collimating. The 35/2.8 has what appears to be a very sturdy aperture mechanism and the general construction seems pretty straightforward too. I reckon it should be too hard to work on if you know your way around lenses.

I for one would be interested to know the optical layout of that lens, how many elements in how many groups?

 

[stompyq]

I was wondering if i can shim this by making the M mount adapter a little thicker? Kind of curious also if my lens is actually not optimized for the Leica standard and is more like the contax? what are they 51.5 vs 52.7mm?

 

[johannielscom]

All lenses Komura made were conform Leica standard, not for Russian cameras. The lens may have been re-assembled badly after a CLA.