Canon RF 28-70mm F2.0 L USM vs Sigma 17-40mm F1.8 DC | Art 025
Both are Canon RF zoom lenses. Here is what actually differs.
Pick the Canon RF 28-70mm F2.0 L USM if
- You need more reach: 70mm vs 40mm at the long end
- You shoot full frame: the Sigma 17-40mm F1.8 DC | Art 025 is made for APS-C
- Our notes say it suits: Weddings, portraits, low-light events
Pick the Sigma 17-40mm F1.8 DC | Art 025 if
- You need ⅓ stop more light for low light or background blur (f/1.8 vs f/2)
- You want the lighter lens to carry: 870 g lighter (560 g vs 1430 g)
- You want a wider view: 17mm vs 28mm at the wide end
- You shoot close-ups: it focuses down to 0.28 m vs 0.39 m
- You want bigger close-ups: 0.21× vs 0.18× maximum magnification
Spec differences
15 differences| Canon RF 28-70mm F2.0 L USM | Sigma 17-40mm F1.8 DC | Art 025 | |
|---|---|---|
| Brand |
Canon
|
Sigma
|
| Format |
Full frame
|
APS-C
|
| Focal length |
28-70mm
|
17-40mm
|
| Max aperture |
f/2
|
f/1.8
⅓ stop faster
|
| Weight |
1430 g
|
560 g
lighter
|
| Length |
139.8 mm
|
115.9 mm
shorter
|
| Diameter |
103.8 mm
|
72.9 mm
slimmer
|
| Filter thread |
95 mm
|
67 mm
|
| Min focus distance |
0.39 m
|
0.28 m
closer
|
| Max magnification |
0.18×
|
0.21×
larger
|
| Aperture blades |
9
|
11
more blades
|
| Optical design |
19 elements / 13 groups
|
17 elements / 11 groups
|
| Autofocus motor |
USM
|
not listed
|
| Weather sealing |
not listed
|
Yes
|
| Released |
2018
|
2025
|
3 identical specs hidden: mount, type, image stabilization. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Image stabilization
- No both
Our notes
Canon RF 28-70mm F2.0 L USM
A large-aperture standard zoom for Canon RF full-frame cameras with a constant f/2 aperture. No image stabilization; large and heavy.
Pros
- f/2 across the zoom range
- Replaces several primes
- Weather-sealed L build
Cons
- No image stabilization
- Very heavy (1.43 kg)
- Large 95mm filter thread
Our notes
Sigma 17-40mm F1.8 DC | Art 025
The Sigma 17-40mm F1.8 DC | Art 025 is an APS-C fast wide-angle zoom lens covering 17-40mm at f/1.8 for Canon RF mount cameras, from the Sigma Art line. It covers wide angles for landscapes, interiors and architecture.
More comparisons
Canon RF 28-70mm F2.0 L USM vs Sigma 17-40mm f/1.8 DC
more reach (70mm) vs ⅓ stop faster
Canon RF 15-35mm F2.8 L IS USM vs Sigma 17-40mm F1.8 DC | Art 025
wider (15mm) vs 1⅓ stops faster
Canon RF 28-70mm F2.0 L USM vs Tamron 16-50mm f/2.8 A
1 stop faster vs 1125 g lighter
Sigma 17-40mm F1.8 DC | Art 025 vs Tamron 11-20mm f/2.8 Di III-A RXD
1⅓ stops faster vs wider (11mm)
Canon RF 28-70mm F2.0 L USM vs Tamron 17-70mm f/2.8 Di III-A VC RXD
1 stop faster vs wider (17mm)
Sigma 17-40mm F1.8 DC | Art 025 vs Tamron 16-50mm f/2.8 A
1⅓ stops faster vs 255 g lighter