N°433407 · Family detail
RicohTelephoto·M42 mount
Ricoh Auto Rikenon 400mm F/6.3
Specifications01
MountM42
Focal length400mm
Max aperturef/6.3
TypeTelephoto · Prime
Weight1050 g
Filter size72 mm
Min focus distance8 m
Aperture blades8
Optical elements4
Groups3
AutofocusNo
StabilizationNo
Aperture controlAperture ring (Manual settings only)
Lens hoodBuilt-in telescopic round
TeleconvertersNot available
EraFilm era
Production statusDiscontinued
Additional Info02
Lens TypeSuper telephoto prime lens
Field Notes02
Ricoh Auto Rikenon is a fixed 400mm f/6.3 telephoto lens for M42 screw-mount cameras, intended for long-distance subjects such as sports or wildlife.
AI-assisted summary — verify against linked sourcesOther Mounts03
No alternate mounts are indexed for this family yet.