Focus
Manual
Mount
Pentax K
Format
35mm full frame
Groups
12
Elements
13
Weight
600g
Spec Notes
Rectilinear ultrawide. Built-in filters (no front thread). Produced 1975-1984. Distinct design from the later A 15/3.5 (which reuses these optics).
Max Aperture
f/3.5
Min Focus Distance
30cm
Aperture Blades
6
Introduced
1975