Focus
Manual
Mount
Pentax K
Format
35mm full frame
Groups
5
Elements
6
Weight
221g
Filter Thread
52mm
Spec Notes
K-series economy normal, 52mm filter. Radioactivity NOT documented for the K-bayonet 55 (the famous thoriated 55/1.8 is the earlier M42 Takumar - do not conflate). Produced 1975-1977.
Max Aperture
f/1.8
Min Focus Distance
45cm
Aperture Blades
6
Introduced
1975