The Tamron 20mm F2.8 Di III OSD M1:2 is a 20 mm prime lens with a maximum aperture of f/2.8 for the Sony E 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
Sony E
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 (52)
- Sony NEX-3
- Sony NEX-C3
- Sony NEX-F3
- Sony NEX-3N
- Sony NEX-5
- Sony NEX-5N2011
- Sony NEX-5R2012
- Sony NEX-5T2013
- Sony NEX-62012
- Sony NEX-72011
- Sony Alpha 60002014
- Sony Alpha 3000
- Sony Alpha 50002014
- Sony Alpha 51002014
- Sony Alpha 72013
- Sony Alpha 7R2013
- Sony Alpha 7R II2015
- Sony Alpha 7 III2018
- Sony Alpha 7R III2017
- Sony Alpha 7R IIIA2021
- Sony Alpha 7 IV2021
- Sony Alpha 7 V
- Sony Alpha 7R IV2019
- Sony Alpha 7R IVA2021
- Sony Alpha 7R V2022
- Sony Alpha 7R VI
- Sony Alpha 7S2014
- Sony Alpha 7 II2014
- Sony Alpha 7C2020
- Sony Alpha 7C II2023
- Sony Alpha 7CR2023
- Sony Alpha 7S II2015
- Sony Alpha 7S III2020
- Sony Alpha 61002019
- Sony Alpha 6100A
- Sony Alpha 63002016
- Sony Alpha 64002019
- Sony Alpha 6400A
- Sony Alpha 65002016
- Sony Alpha 66002019
- Sony Alpha 67002023
- Sony Alpha 92017
- Sony Alpha 9 II2019
- Sony Alpha 9 III2023
- Sony Alpha 12021
- Sony Alpha 1 II2024
- Sony FX2
- Sony FX32021
- Sony FX302022
- Sony ZV-E12023
- Sony ZV-E102021
- Sony ZV-E10 II2024
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Tamron 20mm F2.8 Di III OSD M1:2 equivalent to on APS-C?
About 30 mm (1.5×) or 32 mm on Canon APS-C (1.6×).
Which cameras is the Tamron 20mm F2.8 Di III OSD M1:2 compatible with?
It fits Sony NEX-3, Sony NEX-C3, Sony NEX-F3, Sony NEX-3N, Sony NEX-5 and more (see the full list above).