Originally posted by hcarvalhoalves You say that because of the viewfinder magnification? Does it interfere negatively when using a 35mm or longer lens? Sorry for the ignorance, I don't know anything about rangefinders.
It is because of the magnification. I think on the R4 you can select something like 28mm, 35, or 50mm for framelines, whereas the R3 is a life-size finder that you can select 35, 50, or something like 85. They take all the same lenses, it's just about the finder coverage and magnification they come with.