Focus
Manual
Mount
Pentax K
Format
35mm full frame
Groups
4
Elements
4
Weight
449g
Filter Thread
55mm
Length mm
82
Generation
XR Rikenon (distinct from the M42 135/2.8, which is 4/3)
Stabilized
No
Diameter mm
65
Max Aperture
f/2.8
Min Aperture
f/16
Min Focus Distance
150cm
Weather Sealed
No
Aperture Blades
8
Introduced
1978
Focal Length (Max)
135mm
Focal Length (Min)
135mm