mojobebop
Well-known
Which you keep: it'll be affected both by what you shoot and which voigtlander you get.
i'd consider keeping the M3 for its VF and EBL, and even shooting a 35 lens on it using the whole VW. This lets you shoot 35mm on it w/o external VF and also have a long base length rangefinder for long fast lenses (should you ever shoot them). Then get a Voigtlander for your shorter lenses and with a meter -- it has a shorter EBL, however.
That might cover the bases.
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you can shoot w/a 35mm, & not use the an external vf?