N°103585 · Family detail
RicohPortrait·PENTAX K mount·1981
Ricoh XR Rikenon 50mm F/2 S
Specifications01
MountPENTAX K
Focal length50mm
Max aperturef/2
TypePortrait · Prime
Release year1981
Weight140 g
Filter size52 mm
Min focus distance0.6 m
Aperture blades6
Optical elements6
Groups5
AutofocusNo
StabilizationNo
Aperture controlAperture ring (Manual settings only)
EraFilm era
Production statusDiscontinued
Additional Info02
Lens TypeStandard prime lens
Field Notes02
Ricoh Rikenon 50mm prime lens for the Pentax K mount, with a maximum aperture of f/2. Intended for general-purpose use such as portraits and low-light photography.
AI-assisted summary — verify against linked sources
Other Mounts03
No alternate mounts are indexed for this family yet.