Ricoh Auto Rikenon 55mm f1.4 for Singlex battery cover with minor surface marks and

with minor surface marks and wear from normal use

Frame counting and spacing are good

contemporary 4x5 monorail camera with indexed movements front and rear

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

An impressive monument of a viewfinder

Ricoh Auto Rikenon 55mm f1.4 for Singlex battery cover with minor surface marks andHere'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