Nikon AF Nikkor 20mm F/2.8

Ultra-wide angle prime lens • Film era • Discontinued

Announced:
· February 1989
Production status:
● Discontinued
Country of design:
· Japan
Original name:
· Nikon AF NIKKOR 20mm 1:2.8
Class:
· Fast full-frame ultra-wide angle prime lens
· Professional model
System:
· Nikon F (1959)

Abbreviations

AF	Autofocus lens with mechanical coupling with camera. Learn more

Model history (4)

■Nikon AI-S Nikkor 20mm F/2.8	A	12 - 9	0.25m	⌀62	1984 ●
■Nikon AF Nikkor 20mm F/2.8	A	12 - 9	0.25m	⌀62	1989 ●
■Nikon AF Nikkor 20mm F/2.8D	A	12 - 9	0.25m	⌀62	1994 ●
■Nikon AF-S Nikkor 20mm F/1.8G ED	A	13 - 11	0.20m	⌀77	2014 ●

Specification

Optical design:
Maximum format:	35mm full frame
Focal length:	20mm
Speed:	F/2.8
Lens construction:	12 elements in 9 groups
Lens construction:	Close Range Correction (CRC)
Mount and Flange focal distance:	Nikon F [46.5mm]
Diagonal angle of view:	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/4.3 (in terms of depth of field)
Diagonal angle of view:	70.5°
Diaphragm mechanism:
Diaphragm type:	Automatic
Aperture control:	Aperture ring (Manual settings + Auto Exposure setting)
Number of blades:	7 (seven)
Focusing:
Closest focusing distance:	0.25m
Magnification ratio:	1:8.33
Focusing modes:	Autofocus (AF), Manual focus (MF)
Autofocus motor:	In-camera motor
Manual focus control:	Focusing ring
Focus mode selector:	None; focusing mode is set from the camera
Manual focus override in autofocus mode:	-
Vibration Reduction (VR):
Built-in VR:	-
Physical characteristics:
Weight:	270g
Maximum diameter x Length:	⌀69×42.5mm
Weather sealing:	-
Fluorine coating:	-
Accessories:
Filters:	Screw-type 62mm
Lens hood:	HB-4 - Bayonet-type round
Teleconverters:	Nikon Teleconverter TC-14 → 28mm F/3.9
	Nikon Teleconverter TC-14A → 28mm F/3.9
	Nikon Teleconverter TC-200 → 40mm F/5.6
	Nikon Teleconverter TC-201 → 40mm F/5.6

Source of data

Manufacturer's technical data.

Notes

The autofocus will not be available with Nikon D40, D40X, D60, D3000-D3500, D5000-D5600 digital SLR cameras.

Compared to other ultra-wide angle prime lenses in the Nikon F system

Lightest weight (270g), along with the AF Nikkor 20/2.8D
Shortest length (42.5mm), along with the AF Nikkor 20/2.8D

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

■Nikon F mount (4)
Nikon AF Nikkor 14mm F/2.8D ED	Pro	2000 ●	compare	1	3
Advantages: 1 Disadvantages: 3 · Newer model (2000) · In production · Wider angle of view · Aspherical design · No floating element system (but has internal focusing) · Slightly smaller closest focusing distance (0.20m vs 0.25m) · Slightly larger magnification (1:6.67 vs 1:8.33) · Has focus mode selector (A - M) · Much heavier (670g vs 270g) · Much larger (86.5mm vs 42.5mm) · No filter thread · Built-in lens hood HIDE
Nikon AF Nikkor 18mm F/2.8D • ⌀77	Pro	1994 ●	compare	0	3
Advantages: 0 Disadvantages: 3 · Newer model (1994) · Slightly wider angle of view · Aspherical design · No floating element system (but has internal focusing) · Slightly smaller magnification (1:9.1 vs 1:8.33) · Much heavier (380g vs 270g) · Larger (58mm vs 42.5mm) · Larger filter size (77mm vs 62mm) HIDE
Nikon AF Nikkor 20mm F/2.8D • ⌀62	Pro	1994 ●	compare	0	0
Advantages: 0 Disadvantages: 0 In terms of specification, there are no significant differences between these lenses. HIDE
Nikon AF-S Nikkor 20mm F/1.8G ED • ⌀77	Pro	2014 ●	compare	5	3
Advantages: 5 Disadvantages: 3 · Newer model (2014) · In production · Faster · Optimized for digital cameras · Aspherical design · No floating element system (but has internal focusing) · Slightly smaller closest focusing distance (0.20m vs 0.25m) · Larger magnification (1:4.35 vs 1:8.33) · Silent Wave Motor · Has focus mode selector (M/A - M) · Manual focus override in autofocus mode · Heavier (355g vs 270g) · Much larger (80.5mm vs 42.5mm) · Larger filter size (77mm vs 62mm) · Not compatible with teleconverters HIDE

Lenses with similar focal length

■Nikon F mount (5)
Sigma 20mm F/1.8 EX DG Aspherical RF • ⌀82	Pro	2000 ●	compare	2	3
Advantages: 2 Disadvantages: 3 · Newer model (2000) · Faster · Optimized for digital cameras · Aspherical design · No floating element system (but has internal focusing) · More diaphragm blades (9 vs 7) · Slightly smaller closest focusing distance (0.20m vs 0.25m) · Larger magnification (1:4 vs 1:8.33) · Features Focus Clutch Mechanism · Much heavier (500g vs 270g) · Much larger (87mm vs 42.5mm) · Larger filter size (82mm vs 62mm) · Not compatible with teleconverters HIDE
Sigma 18mm F/3.5 ZEN • ⌀72	Pro	1992 ●	compare	0	3
Advantages: 0 Disadvantages: 3 · Newer model (1992) · Slightly wider angle of view · Slightly slower · Less diaphragm blades (6 vs 7) · Slightly smaller magnification (1:8.5 vs 1:8.33) · Heavier (355g vs 270g) · Larger (57.8mm vs 42.5mm) · Larger filter size (72mm vs 62mm) HIDE
Sigma 20mm F/1.4 DG HSM \| A	Pro	2015 ●	compare	5	4
Advantages: 5 Disadvantages: 4 · Newer model (2015) · In production · Much faster · Optimized for digital cameras · Aspherical design · No floating element system · More diaphragm blades (9 vs 7) · Slightly larger closest focusing distance (0.276m vs 0.25m) · Slightly larger magnification (1:7.1 vs 1:8.33) · Hyper Sonic Motor · Has focus mode selector (AF - MF) · Manual focus override in autofocus mode · Much heavier (950g vs 270g) · Much larger (129.8mm vs 42.5mm) · No filter thread · Built-in lens hood · Not compatible with teleconverters NOTE: Approximate weight and length were used for comparison purposes. HIDE
Tokina AT-X Pro AF 17mm F/3.5 Aspherical • ⌀77	Pro	1999 ●	compare	0	3
Advantages: 0 Disadvantages: 3 · Newer model (1999) · Slightly wider angle of view · Slightly slower · Aspherical design · More diaphragm blades (8 vs 7) · Features Focus Clutch Mechanism · Much heavier (440g vs 270g) · Much larger (65mm vs 42.5mm) · Larger filter size (77mm vs 62mm) HIDE
Tokina AT-X AF 17mm F/3.5 Aspherical • ⌀72	Pro	1993 ●	compare	0	3
Advantages: 0 Disadvantages: 3 · Newer model (1993) · Slightly wider angle of view · Slightly slower · Aspherical design · Much heavier (400g vs 270g) · Much larger (80.5mm vs 42.5mm) · Larger filter size (72mm vs 62mm) · Built-in lens hood HIDE

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