Focus
Manual
Mount
Pentax K
Format
35mm full frame
Groups
10
Elements
12
Weight
300g
Filter Thread
58mm
Spec Notes
58mm filter. GENUINELY DISTINCT from the SMC Pentax-M 20/4 (8/8, 49mm, 150g) — different design, not a fold. Produced 1975-1977.
Max Aperture
f/4
Min Focus Distance
25cm
Aperture Blades
5
Introduced
1975