The Nikon Nikkor AI-S 20mm f/2.8 is a 20 mm prime lens with a maximum aperture of f/2.8 for the Nikon F AI-S mount. Here are its field of view on different sensors, hyperfocal distances, Milky Way exposure limits and the cameras it fits.
Focal length
20 mm
Max aperture
f/2.8
Mount
Nikon F AI-S
Designed for
Full frame
Field of view by sensor
| Sensor | Diagonal angle of view | 35 mm equivalent |
|---|---|---|
| Full frame | 94.5° | 20 mm |
| APS-C (1.5×) | 70.5° | 31 mm |
| Canon APS-C (1.6×) | 68.1° | 32 mm |
| Micro Four Thirds | 56.8° | 40 mm |
Hyperfocal distance
| Focal length | f/2.8 | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|---|
| 20 mm | 4.8 m | 2.4 m | 1.7 m | 1.2 m | 0.9 m |
Circle of confusion 0.030 mm (sensor size the lens is designed for).
Longest exposure for sharp stars
| Camera | NPF rule (wide open) | 500 rule |
|---|---|---|
| Full frame (24 MP) | 13.8 s @ f/2.8 | 25.0 s |
| Full frame (45 MP) | 11.5 s @ f/2.8 | 25.0 s |
| APS-C (24 MP) | 10.8 s @ f/2.8 | 16.3 s |
Cameras that fit (89)
- Nikon 1 S1
- Nikon 1 V1
- Nikon 1 J1
- Nikon 1 AW1
- Nikon 1 S2
- Nikon 1 V2
- Nikon 1 J2
- Nikon 1 V3
- Nikon 1 J3
- Nikon 1 J4
- Nikon 1 J5
- Nikon Z 52020
- Nikon Z5II2025
- Nikon Z5IIC
- Nikon Z 62018
- Nikon Z 6II2020
- Nikon Z6III2024
- Nikon Z 72018
- Nikon Z 7II2020
- Nikon Z 82023
- Nikon Z 92021
- Nikon Z f2023
- Nikon ZR
- Nikon Z 302022
- Nikon Z 502019
- Nikon Z50II2024
- Nikon Z fc2021
- Nikon D40
- Nikon D40X
- Nikon D50
- Nikon D60
- Nikon D70
- Nikon D70s
- Nikon D80
- Nikon D902008
- Nikon D100
- Nikon D200
- Nikon D300
- Nikon D300S2009
- Nikon D5002016
- Nikon D6002012
- Nikon D6102013
- Nikon D7002008
- Nikon D7502014
- Nikon D7802020
- Nikon D8002012
- Nikon D800E2012
- Nikon D8102014
- Nikon D8502017
- Nikon D3000
- Nikon D3100
- Nikon D3200
- Nikon D33002014
- Nikon D34002016
- Nikon D35002018
- Nikon D5000
- Nikon D5100
- Nikon D5200
- Nikon D53002013
- Nikon D55002015
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Nikon Nikkor AI-S 20mm f/2.8 equivalent to on APS-C?
About 30 mm (1.5×) or 32 mm on Canon APS-C (1.6×).
Which cameras is the Nikon Nikkor AI-S 20mm f/2.8 compatible with?
It fits Nikon 1 S1, Nikon 1 V1, Nikon 1 J1, Nikon 1 AW1, Nikon 1 S2 and more (see the full list above).