Thanks everyone. I had the chance to talk to Stephen Gandy and he told me, about the Jupiters, rhat "most won't fit, none will meter".
By curiosity, the metering lights in the Bessa L stay on for some seconds after you slightly press the shutter, right? Because i tried a Jupiter 8 (50 mm) in my bessa L body and the metering lights stay on only when you press the shutter...I hope it's not like that with the snapshot skopar I'm waiting for.
Again, thanks a lot everyone.
H