Canon RF 28-70mm F2.0 L USM vs Sigma 17-40mm f/1.8 DC
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 f/1.8 DC is made for APS-C
- Our notes say it suits: Weddings, portraits, low-light events
Pick the Sigma 17-40mm f/1.8 DC if
- You need ⅓ stop more light for low light or background blur (f/1.8 vs f/2)
- 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
- You care about the shape of out-of-focus highlights: 11 aperture blades vs 9
Spec differences
14 differences| Canon RF 28-70mm F2.0 L USM | Sigma 17-40mm f/1.8 DC | |
|---|---|---|
| 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
|
not listed
|
| Length |
139.8 mm
|
not listed
|
| Diameter |
103.8 mm
|
not listed
|
| Filter thread |
95 mm
|
not listed
|
| 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
|
| Released |
2018
|
not listed
|
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 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.
More comparisons
Canon RF 28-70mm F2.0 L USM vs Sigma 17-40mm F1.8 DC | Art 025
more reach (70mm) vs ⅓ stop faster
Canon RF 15-35mm F2.8 L IS USM vs Sigma 17-40mm f/1.8 DC
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 f/1.8 DC 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 f/1.8 DC vs Tamron 16-50mm f/2.8 A
1⅓ stops faster vs wider (16mm)