Body for J-12

The huge back-element of the J-12 nearly touches the Bessa's shutter blades inside the body.
Every lens moves its elements when you shift the focussing ring. If you turn into direction of infinity, the back element will turn further inside.
So, to avoid the J-12's back element to touch the shutter blades, you can not turn it all the way.
 
I just got a used J-12. It does have a big rear end. It fits my CLE, my Hexar RF, but not the Bessa R2. On the R2, it's jammed against the rear of the compartment (seems unsafe) and won't turn properly to the 15 M and Infinity focus positions. I'm not brave enough to see if it actually puts pressure on the shutter or is just very, very close.
 
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