Indeed. 20 million lemmings can't be wrong
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Actually, although I don't use rangefinders normally, they do have a couple of differences that might make them more suitable for some types of photography, both connected with a lack of mirror.
1. Less delay between pressing the release and the exposure being made, as no need to wait for the mirror to clear out of the way.
2. Quieter operation, as no mirror sounds.
These could result in less camera vibration and hence sharper photos.
And dare I add that not having a mirror in the way means that the lens can be closer to the film plane without fouling anything? As short focal length lenses have, in the absence of being designed as retrofocus, have to sit closer to the film, this do actually make them easierr to make for rangefinders. Remove the constraint of a retrofocus design, and the lens designer's job becomes easier (read either better or cheaper lenses). It's said that the wide angles on rangefinder design cameras are better than those that have to accespt the additional compromise of a retrofocus desgn.