Canon RF 10-20mm F4 L IS STM vs Sigma 17-40mm f/1.8 DC
Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.
Sigma
17-40mm f/1.8 DC
Verdict at a glance
- Sigma 17-40mm f/1.8 DC is faster by 2.3 stops (f/1.8 vs f/4.0), letting in more light.
- Canon RF 10-20mm F4 L IS STM goes wider (10mm vs 17mm).
- Sigma 17-40mm f/1.8 DC reaches further (40mm vs 20mm).
| Spec | RF 10-20mm F4 L IS STM | 17-40mm f/1.8 DC |
|---|---|---|
| Brand | Canon | Sigma |
| Mount | Canon RF | Canon RF |
| Type | Wide Zoom | Zoom |
| Focal length | 10-20mm (wider) | 17-40mm |
| Max aperture | f/4.0 | f/1.8 (faster) |
| Released | 2023 | n/a |
| Blades | 9 | 11 |
| Format | full-frame | aps-c |
| Groups | 12 | 11 |
| Af motor | STM | n/a |
| Elements | 16 | 17 |
| Weight g | 570.0 | n/a |
| Length mm | 112.0 | n/a |
| Stabilized | Yes | n/a |
| Diameter mm | 83.7 | n/a |
| Min focus m | 0.25 (closer focusing) | 0.28 |
| Max magnification | 0.12 | 0.21 |
Canon RF 10-20mm F4 L IS STM
A full-frame ultra-wide zoom for Canon RF mirrorless cameras with image stabilization and a constant f/4 aperture. L-series build.
Pros
- Very wide 10mm start
- Constant f/4
- Image stabilization
- L-series build
Cons
- Bulbous front element limits filter use
- Slower than f/2.8 wide zooms
- Software distortion correction is part of the design
Sigma 17-40mm f/1.8 DC
This 17-40mm f/1.8 APS-C fast wide-angle zoom lens from Sigma fits Canon RF mount cameras. It covers wide angles for landscapes, interiors and architecture.