N°431243 · Family detail
RicohWide·M42 mount
Ricoh Auto Rikenon 21mm F/3.8
Specifications01
MountM42
Focal length21mm
Max aperturef/3.8
TypeWide · Prime
Weight290 g
Filter size72 mm
Min focus distance0.3 m
Aperture blades6
Optical elements9
Groups8
AutofocusNo
StabilizationNo
TeleconvertersNot available
EraFilm era
Production statusDiscontinued
Additional Info02
Lens TypeUltra-wide angle prime lens
Summary02
Ricoh Auto Rikenon 21mm f/3.8 wide-angle prime lens for M42 screw-mount cameras, suited for landscapes and general wide views. Typical aperture for moderate depth of field.
AI-assisted summary — verify against linked sourcesWhere can this lens be adapted?
The M42 screw mount has a flange distance of 45.46 mm. A plain adapter fits a camera whose flange distance is at least 1.46 mm shorter. How lens adapters work
- Many M42 lenses close the aperture only when a pin at the rear is pressed. Use an adapter that presses the pin, or set the A/M switch to M.
- Sony EAdapter · 27.46 mm
- Canon RFAdapter · 25.46 mm
- Nikon ZAdapter · 29.46 mm
- Fujifilm XAdapter · 27.76 mm
- L-MountAdapter · 25.46 mm
- Micro Four ThirdsAdapter · 26.21 mm
- Fujifilm G (GFX)Adapter · 18.76 mm
Covers full-frame: it can vignette on a medium format sensor.
- Canon EF-MAdapter · 27.46 mm
- Canon EFAdapter · 1.46 mm
A rear element that sticks out can hit the camera mirror.
No plain adapter reaches infinity focus on: Nikon F.
Sources03
thelensdb.comVisit ↗
Other Mounts03
No alternate mounts are indexed for this family yet.