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OPTIMAL PRICES
Adorama: $499.95

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Nikkor 20mm f/2.8 AI-S MF
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DESCRIPTION

1. 2.8-22 aperture range and 1:2.8 aperture ratio
2. 94 degrees Picture angle
3. CAC close-range correction
4. Automatic diaphragm type

12 elements in 9 groups
Closest Marked Focusing Distance [m] 0.25
Filter Attachment Size [mm] 62
Dimensions: Dia x Length (extension from lens mount), [mm] 65 x 42.5
Weight [g] 260

LEGEND
MFManual Focus
AI-SA variant of AI designed to be used with Program and Shutter-priority exposure modes (1982). Manual focus lens. Distinguished by smallest aperture being printed in orange and a small scoop on the bayonet flange, which transmits aperture info. Otherwise same as AI

Reviews
by Ken Rockwell, Test Review
http://www.kenrockwell.com/nikon/20f28ais.htm