Focus
Autofocus
Mount
Nikon F
Format
35mm full frame
Groups
9
Elements
12
Weight
257g
Filter Thread
62mm
Length mm
54
Spec Notes
AF (1989) + AF-D (1994) folded - chip-only difference (D adds distance encoding); same 12/9 optics as the MF AI-S 20/2.8. 7 straight blades.
Diameter mm
69
Max Aperture
f/2.8
Min Aperture
f/22
Min Focus Distance
25cm
Aperture Blades
7
Introduced
1989
Electronic Contacts
Yes