The Samyang 20mm f/1.8 ED AS UMC is a 20 mm prime lens with a maximum aperture of f/1.8 for the Pentax K, Canon EF, Nikon F AI mounts. 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/1.8
Mount
Pentax K
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) | 12.0 s @ f/1.8 | 25.0 s |
| Full frame (45 MP) | 9.8 s @ f/1.8 | 25.0 s |
| APS-C (24 MP) | 9.0 s @ f/1.8 | 16.3 s |
Cameras that fit (489)
- KMZ Zenit 122K
- KMZ Zenit 212K
- KMZ Zenit 312K
- KMZ Zenit KM
- 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
- Fujifilm X-Pro12012
- Fujifilm X-Pro22016
- Fujifilm X-E1
- Fujifilm X-E22013
- Fujifilm X-E2S
- Fujifilm X-E32017
- Fujifilm X-E42021
- Fujifilm X-E5
- Fujifilm X-T12014
- Fujifilm X-T22016
- Fujifilm X-T32018
- Fujifilm X-T42020
- Fujifilm X-T52022
- Fujifilm X-Pro32019
- Fujifilm X-H12018
- Fujifilm X-H22022
- Fujifilm X-H2S2022
- Fujifilm X-M1
- Fujifilm X-M52024
- Fujifilm X-A1
- Fujifilm X-A2
- Fujifilm X-T102015
- Fujifilm X-T202017
- Fujifilm X-T302019
- Fujifilm X-T30 II2021
- Fujifilm X-T30 III
- Fujifilm X-T502024
- Fujifilm X-S102020
- Fujifilm X-S202023
- Fujifilm X-T100
- Fujifilm X-T200
- Fujifilm X-A3
- Fujifilm X-A5
- Fujifilm X-A7
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Samyang 20mm f/1.8 ED AS UMC equivalent to on APS-C?
About 30 mm (1.5×) or 32 mm on Canon APS-C (1.6×).
Which cameras is the Samyang 20mm f/1.8 ED AS UMC compatible with?
It fits KMZ Zenit 122K, KMZ Zenit 212K, KMZ Zenit 312K, KMZ Zenit KM, Canon EOS 5DS and more (see the full list above).