leica 135mm f4.5 hektor BM / M mount.

[FrankS]

XE2, focusing unit, extension tube, Pentax 50f1.4

 

[lundrog]

I grabbed a Leica Leitz ZOOAN Short Focusing mount 16495 for $32 shipped.

Thoughts on any other recommendations to add into the mix.

Thus far, three 16471J "OTRPO" adapters and one "OSTRO" 16472K adapter and a ZOOAN adapter.