Ricoh Auto Rikenon 55mm f1.4 for Singlex battery cover An impressive monument of a

An impressive monument of a viewfinder

5 viewfinder correction lens for M series (model 14352)

while the back's serial number is 548

The Nikon HN-3 is a round metal hood for 52mm threaded lenses

Ricoh Auto Rikenon 55mm f1.4 for Singlex battery cover An impressive monument of aHere's some interesting trivia: back in the day, Mamiya built the Nikkorex F for Nikon, and they also built the original Singlex for Ricoh both with an F mount, weirdly enough. And while the Ricoh Singlex can take Nikon lenses, the Singlex F mount lenses like this Ricoh Auto Rikenon 55mm f1. 4 can't be used directly on a Nikon camera without modification: one of the bayonet lugs is a touch too long to fit. Nevertheless, flange distance is the same as