Focus
Manual
Mount
Pentax K
Format
35mm full frame
Groups
6
Elements
7
Weight
265g
Filter Thread
52mm
Spec Notes
THORIATED (mildly radioactive) rear element - characteristic amber yellowing (UV-reversible). 52mm filter. The later M/A 50/1.4 (49mm, 235g) are non-radioactive. Produced 1975-1977.
Radioactive
Yes
Max Aperture
f/1.4
Min Focus Distance
45cm
Aperture Blades
8
Introduced
1975