David Murphy
Veteran
As already mentioned by some of the above, the FSU copies of the Zeiss Ikon turret finder are pretty good and reasonably priced - nice to have around. The various plastic non-parallax compensated FSU fixed focal length viewfinders also work pretty well (within their limitations) and are fairly low-priced. The parallax corrected Japanese viewfinders imported during the hey-day of the 35mm rangefinder (most pretty well made), are starting to get expensive these days.