Ricoh Auto Rikenon 55mm f1.4 for Singlex brand_Gralab The barrel has been tapped

The barrel has been tapped along its central portion

Very minor coating mark on front element

A little tabletop table with a micro ball head

Standard 1/4"x20 thread for camera mounting

The clamp up top is Arca-compatible

Ricoh Auto Rikenon 55mm f1.4 for Singlex brand_Gralab The barrel has been tappedHere'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