Focus
Manual
Mount
Nikon F
Format
35mm full frame
Groups
9
Elements
11
Weight
390g
Filter Thread
72mm
Spec Notes
11/9, the original 1968 ultra-wide ('UD' = distortion-corrected marketing name, not a letter code). Single-coated, 72mm filter. Pre-AI. A wholly different lens from the 1979 20/3.5 AI.
Max Aperture
f/3.5
Min Aperture
f/22
Min Focus Distance
30cm
Introduced
1968