The Canon EF 20mm f/2.8 USM is a 20 mm prime lens with a maximum aperture of f/20 for the Canon EF 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/20
Mount
Canon EF
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 |
|---|
| 20 mm |
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) | 43.9 s @ f/20 | 25.0 s |
| Full frame (45 MP) | 41.6 s @ f/20 | 25.0 s |
| APS-C (24 MP) | 40.9 s @ f/20 | 16.3 s |
Cameras that fit (132)
- Canon EOS 5DS2015
- Canon EOS 5DS R2015
- Canon EOS 6D2012
- Canon EOS 6D Mark II2017
- Canon EOS 5D Mark IV2016
- Canon EOS 5D Mark III2012
- Canon EOS 5D Mark II2008
- Canon EOS 5D
- Canon EOS-1Ds
- Canon EOS-1Ds Mark II
- Canon EOS-1D Mark II
- Canon EOS-1D Mark II N
- Canon EOS-1Ds Mark III
- Canon EOS-1D Mark III
- Canon EOS-1D Mark IV
- Canon EOS-1D
- Canon EOS-1D X2011
- Canon EOS-1D X Mark II2016
- Canon 35mm film: full frame
- Kodak DCS Pro SLR/c
- Kodak DCS 520
- Canon EOS D2000
- Canon EOS M
- Canon EOS M2
- Canon EOS M3
- Canon EOS M52016
- Canon EOS M6
- Canon EOS M6 Mark II2019
- Canon EOS M10
- Canon EOS M502018
- Canon EOS M50 Mark II2020
- Canon EOS KISS M
- Canon EOS M1002017
- Canon EOS M2002019
- Canon EOS R72022
- Canon EOS R102022
- Canon EOS R502023
- Canon EOS R50 V
- Canon EOS R1002023
- Canon EOS R2018
- Canon EOS RP2019
- Canon EOS R12024
- Canon EOS R32021
- Canon EOS R52020
- Canon EOS R5 C
- Canon EOS R5 Mark II2024
- Canon EOS R62020
- Canon EOS R6 Mark II2022
- Canon EOS R6 Mark III
- Canon EOS R6 V
- Canon EOS R82023
- Canon EOS R8 Mark II
- Canon EOS 1000D
- Canon EOS Digital Rebel XS
- Canon EOS Kiss Digital F
- Canon EOS 1100D
- Canon EOS Rebel T3
- Canon EOS Kiss X50
- Canon EOS 300D
- Canon EOS Digital REBEL
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Canon EF 20mm f/2.8 USM equivalent to on APS-C?
About 30 mm (1.5×) or 32 mm on Canon APS-C (1.6×).
Which cameras is the Canon EF 20mm f/2.8 USM compatible with?
It fits Canon EOS 5DS, Canon EOS 5DS R, Canon EOS 6D, Canon EOS 6D Mark II, Canon EOS 5D Mark IV and more (see the full list above).