Focus
Autofocus
Macro
Yes
Mount
Pentax KAF
Format
35mm full frame
Groups
7
Elements
8
Weight
385g
Filter Thread
52mm
Spec Notes
AF native 1:1, 52mm. Produced 1988-1990 (replaced by the near-identical FA 50/2.8 Macro).
Max Aperture
f/2.8
Min Focus Distance
19cm
Aperture Blades
8
Introduced
1988
Reproduction Ratio
1:1