Quote Originally Posted by titrisol
And here it says the MIR/1 requires 45.2mm distance to film plane to work
Yep! That is because the MIR/1 was designed for the Zenit SLR camera (early 1950's) - not a rangefinder! BTW, I own one.

OTOH, the 2.8/35mm Jupiter 12 was designed for rangefinder use and thus has the proper distance to film plane to work properly on Leica rangefinders and Leica clones (like the Bessa R series, Ukrainian FEDs and Russian Zorkis.