Nikon AI Nikkor 20mm F/3.5

Ultra-wide angle prime lens • Film era • Discontinued

  • Announced:
  • · December 1977
  • Production status:
  • ● Discontinued
  • Country of design:
  • · Japan
  • Original name:
  • · Nikon NIKKOR 20mm 1:3.5
  • Class:
  • · Slow full-frame ultra-wide angle prime lens
  • · Professional model
  • System:
  • · Nikon F (1959)

Abbreviations

AI A manual focus lens with automatic maximum aperture indexing, which is a mechanical system for coupling the lens to the camera's exposure system. Learn more

Model history (6)

■Nippon Kogaku Nikkor-O 21mm F/4 • Pancake lensM8 - 40.90m⌀52 1959 ●
■Nippon Kogaku / Nikon Nikkor-UD Auto 20mm F/3.5A11 - 90.30m⌀72 1967 ●
■Nikon Nikkor 20mm F/4A10 - 80.30m⌀52 1974 ●
■Nikon AI Nikkor 20mm F/4A10 - 80.30m⌀52 1977 ●
■Nikon AI Nikkor 20mm F/3.5A11 - 80.30m⌀52 1977 ●
■Nikon AI-S Nikkor 20mm F/3.5A11 - 80.30m⌀52 1981 ●

Specification

Optical design:
35mm full frame
20mm
F/3.5
11 elements in 8 groups
Nikon F [46.5mm]
94.5° (35mm full frame)
On Nikon D APS-C [1.53x] cameras:
35mm equivalent focal length:
30.6mm (in terms of field of view)
35mm equivalent speed:
F/5.4 (in terms of depth of field)
Diagonal angle of view:
70.5°
Diaphragm mechanism:
Diaphragm type:
Automatic
Aperture control:
Aperture ring (Manual settings only)
7 (seven)
Focusing:
0.30m
<No data>
Focusing modes:
Manual focus only
Manual focus control:
Focusing ring
Physical characteristics:
235g
⌀63.5×40.7mm
Accessories:
Screw-type 52mm
HK-6 - Clamp-on round
Not compatible

Sources of data

  • Manufacturer's technical data.
  • Nikkor lenses sales manual (January 1979).

Notes

  • This AI lens was designed for Nikon F3, EL2, EM, FE, FE2, FE10, FG-20, FM, FM2, FM10, FM3A, Nikkormat FT3 AI cameras and Nikon FA, FG, N2000, N6000 AI-S cameras.
  • AI and AI-S lenses are backward compatible with Nikon F, F2, Nikkormat FS, FT, FT2, FTN, EL, ELW cameras.
  • On Nikon digital SLR cameras, the automatic exposure metering with AI and AI-S lenses will not be available on D40, D40X, D60, D70, D70s, D80, D3000-D3500, D5000-D5600 series.

Other ultra-wide angle prime lenses in the Nikon F system

■Nikon F mount (17)
Nikon Nikkor 13mm F/5.6A16 - 120.30m-- 1975 ●
Nikon AI Nikkor 13mm F/5.6A16 - 120.30m-- 1977 ●
Nikon AI-S Nikkor 13mm F/5.6A16 - 120.30m-- 1982 ●
Nippon Kogaku / Nikon Nikkor-QD[·C] Auto 15mm F/5.6A14 - 120.30m-- 1970 ●
Nikon Nikkor 15mm F/5.6A14 - 120.30m-- 1976 ●
Nikon AI Nikkor 15mm F/5.6A14 - 120.30m-- 1977 ●
Nikon AI Nikkor 15mm F/3.5A14 - 110.30m-- 1978 ●
Nikon AI-S Nikkor 15mm F/3.5A14 - 110.30m-- 1981 ●
Nikon Nikkor 18mm F/4A13 - 90.30m⌀86 1974 ●
Nikon AI Nikkor 18mm F/4A13 - 90.30m⌀86 1977 ●
Nikon AI-S Nikkor 18mm F/3.5A11 - 100.25m⌀72 1981 ●
Nikon Nikkor 20mm F/4A10 - 80.30m⌀52 1974 ●
Nikon AI Nikkor 20mm F/4A10 - 80.30m⌀52 1977 ●
Nippon Kogaku / Nikon Nikkor-UD Auto 20mm F/3.5A11 - 90.30m⌀72 1967 ●
Nikon AI-S Nikkor 20mm F/3.5A11 - 80.30m⌀52 1981 ●
Nikon AI-S Nikkor 20mm F/2.8A12 - 90.25m⌀62 1984 ●
Nippon Kogaku Nikkor-O 21mm F/4 • Pancake lensM8 - 40.90m⌀52 1959 ●

Lenses with similar focal length

■Nikon F mount (29)
Cosina Voigtlander Color-Skopar 20mm F/3.5 Aspherical SL IIA9 - 60.20m⌀52 2009 ●
Cosina Voigtlander Color-Skopar 20mm F/3.5 Aspherical SL II NA9 - 60.20m⌀52 2012 ●
Cosina Wide Angle 20mm F/3.8 MCA9 - 80.20m⌀62 ●
Irix 21mm F/1.4 SLRA15 - 110.30m-- 2022 ●
Norita Kogaku Noritar 17mm F/4A11 - 100.30m⌀72 1972 ●
Panagor Auto Wide Angle 21mm F/4A9 - 70.16m⌀82 ●
Sigma MF 18mm F/3.5 ZENA10 - 90.25m⌀72 1992 ●
Sigma MF Ultra-Wide 18mm F/2.8 Multi-Coated IIA10 - 90.25m⌀72 1984 ●
Sigma MF Ultra-Wide 18mm F/2.8 Multi-CoatedA11 - 90.25m⌀67 1980 ●
Sigma MF 18mm F/2.8 FiltermaticA12 - 90.23m⌀77 1978 ●
Soligor Wide-Auto 17mm F/3.5 [MC] (s/n 1xxxxxxx)A11 - 80.22m⌀72 ●
Soligor C/D Wide-Auto 20mm F/2.8 MCA9 - 70.20m⌀58 ●
Soligor Wide-Auto 21mm F/3.8 (s/n 1xxxxxxx)A9 - 80.35m⌀72 ●
Mir-20N 20mm F/3.5 MC
akaМИР-20Н 20mm F/3.5 МС		A9 - 80.18m 1981 ●
Zenitar 20mm F/2.8 MC
akaЗЕНИТАР-К 20mm F/2.8 МС
akaЗЕНИТАР-М 20mm F/2.8 МС
akaЗЕНИТАР-Н 20mm F/2.8 МС
akaЗЕНИТАР-С 20mm F/2.8 МС		A10 - 90.25m⌀67 ●
Mir-73N 20mm F/2.8 MC
akaArsat-H 20mm F/2.8		A10 - 80.25m⌀62 ●
Spiratone Ultra Wideangle 18mm F/3.5 Pluracoat [I]A11 - 80.22m⌀72 1979 ●
Spiratone Ultra Wideangle 18mm F/3.5 Pluracoat [II]A11 - 90.25m⌀67 ●
Spiratone 20mm F/2.8 Plura-CoatA9 - 70.20m⌀58 1983 ●
Tokina 17mm F/3.5 RMC Type 2
akaSpiratone Ultra Wideangle 17mm F/3.5 Pluracoat
akaTokina SL 17mm F/3.5		A11 - 90.25m⌀67 1980 ●
Tokina Wide-Auto 17mm F/3.5 RMC Type 1A11 - 80.22m⌀72 ●
Vivitar Auto Wide-Angle 20mm F/3.8 (s/n 22xxxxxx)A9 - 70.15m⌀82 1969 ●
Vivitar Auto Wide-Angle 17mm F/3.5 (s/n 37xxxxxx)A11 - 80.22m⌀72 1976 ●
Vivitar Wide-Angle 17mm F/3.5 MC (s/n 37xxxxxx)A11 - 90.25m⌀67 ●
Vivitar Wide Angle 19mm F/3.8 MC (s/n 9xxxxxxx)A9 - 80.20m⌀62 ●
Carl Zeiss Classic Distagon T* 18mm F/3.5 ZE / ZF / ZF.2 / ZKA13 - 110.30mE82 2008 ●
Carl Zeiss Classic Distagon T* 21mm F/2.8 ZE / ZF / ZF.2 / ZKA16 - 130.22mE82 2008 ●
ZEISS Milvus Distagon T* 21mm F/2.8 ZE / ZF.2A16 - 130.22mE82 2015 ●
ZEISS Milvus Distagon T* 18mm F/2.8 ZE / ZF.2A14 - 120.25mE77 2016 ●
■Interchangeable mount (6)
Sigma[-XQ] MF [Widerama] 18mm F/3.2 [Multi-Coated] [YS]
akaAccura/Sigma 18mm F/3.2
akaSpiratone 18mm F/3.2
akaSpiratone 18mm F/3.5		A12 - 100.17m⌀72 1972 ●
Soligor Wide-Auto 21mm F/3.8 (s/n 1xxxxxx) [T-4]A9 - 80.35m⌀72 1970 ●
Tamron SP 17mm F/3.5 51B [Adaptall-2]A12 - 100.25m-- 1979 ●
Tamron SP 17mm F/3.5 151B [Adaptall-2]A12 - 100.25m-- 1984 ●
Tamron Auto 21mm F/4.5 [Adapt-A-Matic]A8 - 60.25m⌀82 1970 ●
Vivitar Auto Wide-Angle 21mm F/3.8 (s/n 37xxxxxxx) [T-4]A9 - 80.35m⌀72 ●

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