Focus
Manual
Macro
Yes
Mount
Pentax K
Format
35mm full frame
Groups
7
Elements
7
Weight
470g
Filter Thread
58mm
Spec Notes
NATIVE 1:1 (no adapter) - Pentax first 100/2.8 to reach life-size. 58mm. DISTINCT from the non-macro A 100/2.8 (5/5, 49mm). Produced 1985-1989.
Max Aperture
f/2.8
Min Focus Distance
31cm
Aperture Blades
8
Introduced
1985
Reproduction Ratio
1:1