It's supposed to. The rangefinders are not as bright as bessa, but brighter than FED and XA I shoot with.I take it everything works properly -- shutter speeds; framelines; rangefinder aligned?
I don't know how to check for rangefinder. Framelines seems ok.
I have a leica adapter already. It came as a package with my 21mm skopar.Your Jupiter will be fine, and I presume it is a thread mount? In which case you will need a LTM to M adaptor. Cosina Voigtlander make an excellent range of lenses if you can't afford Leica lenses.
I'll be eating rice and noodles for a while.