Canon RF 28-70mm F2.8 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 1.3 stops (f/1.8 vs f/2.8), letting in more light.
- Sigma 17-40mm f/1.8 DC goes wider (17mm vs 28mm).
- Canon RF 28-70mm F2.8 IS STM reaches further (70mm vs 40mm).
| Spec | RF 28-70mm F2.8 IS STM | 17-40mm f/1.8 DC |
|---|---|---|
| Brand | Canon | Sigma |
| Mount | Canon RF | Canon RF |
| Type | Zoom | Zoom |
| Focal length | 28-70mm | 17-40mm (wider) |
| Max aperture | f/2.8 | f/1.8 (faster) |
| Released | 2024 | n/a |
| Blades | 9 | 11 |
| Format | full-frame | aps-c |
| Groups | 12 | 11 |
| Af motor | STM | n/a |
| Elements | 15 | 17 |
| Weight g | 495.0 | n/a |
| Filter mm | 67 | n/a |
| Length mm | 92.2 | n/a |
| Stabilized | Yes | n/a |
| Diameter mm | 76.5 | n/a |
| Min focus m | 0.27 (closer focusing) | 0.28 |
| Max magnification | 0.24 | 0.21 |
Canon RF 28-70mm F2.8 IS STM
A compact f/2.8 standard zoom for Canon RF full-frame cameras with stabilization and stepping-motor autofocus.
Pros
- Constant f/2.8
- Small and light (495 g)
- Image stabilization
Cons
- Starts at 28mm
- Narrower range than a 24-70
- Relies on digital corrections
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.