Focus
Manual
Mount
Pentax K
Notes
Poor mans Summicron; original + L Tomioka-built, later S/P from other makers
Format
35mm full frame
Groups
5
Made By
Tomioka
Elements
6
Filter Thread
52mm
Generation
XR Rikenon (original 1977; later L/S/P versions 0.6m, non-Tomioka)
Stabilized
No
Max Aperture
f/2
Min Aperture
f/16
Min Focus Distance
45cm
Weather Sealed
No
Aperture Blades
6
Introduced
1977
Focal Length (Max)
50mm
Focal Length (Min)
50mm