The Sigma 17-40mm F1.8 DC | Art 025 is a 17–40 mm zoom lens with a maximum aperture of f/1.8 for the Canon RF mount. Here are its field of view on different sensors, hyperfocal distances, Milky Way exposure limits and the cameras it fits.
Focal length
17–40 mm
Max aperture
f/1.8
Mount
Canon RF
Designed for
1.60× crop
Field of view by sensor
| Sensor | Diagonal angle of view | 35 mm equivalent |
|---|---|---|
| APS-C (1.5×) | 79.5° – 38.9° | 26–61 mm |
| Canon APS-C (1.6×) | 77.0° – 37.4° | 27–64 mm |
| Micro Four Thirds | 64.9° – 30.3° | 34–80 mm |
Hyperfocal distance
| Focal length | f/2.8 | f/5.6 | f/8 | f/11 | f/16 |
|---|---|---|---|---|---|
| 17 mm | 5.5 m | 2.8 m | 1.9 m | 1.4 m | 1.0 m |
| 40 mm | 31 m | 15 m | 11 m | 7.8 m | 5.4 m |
Circle of confusion 0.019 mm (sensor size the lens is designed for).
Longest exposure for sharp stars
| Camera | NPF rule (wide open) | 500 rule |
|---|---|---|
| APS-C (24 MP) | 10.6 s @ f/1.8 | 19.2 s |
Cameras that fit (18)
- 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
Where to buy
B&H PhotoAmazonKEH (used)MPB (used)FAQ
What is the Sigma 17-40mm F1.8 DC | Art 025 equivalent to on APS-C?
It is designed for a 1.60× sensor, giving a full-frame equivalent of 27–64 mm.
Which cameras is the Sigma 17-40mm F1.8 DC | Art 025 compatible with?
It fits Canon EOS R7, Canon EOS R10, Canon EOS R50, Canon EOS R50 V, Canon EOS R100 and more (see the full list above).