Sigma 17-40mm f/1.8 DC vs Tamron 16-50mm f/2.8 A
Both are Canon RF zoom lenses. Here is what actually differs.
Pick the Sigma 17-40mm f/1.8 DC if
- You need 1⅓ stops more light for low light or background blur (f/1.8 vs f/2.8)
- You care about the shape of out-of-focus highlights: 11 aperture blades vs 7
Pick the Tamron 16-50mm f/2.8 A if
- You want a wider view: 16mm vs 17mm at the wide end
- You need more reach: 50mm vs 40mm at the long end
- You shoot close-ups: it focuses down to 0.15 m vs 0.28 m
Spec differences
12 differences| Sigma 17-40mm f/1.8 DC | Tamron 16-50mm f/2.8 A | |
|---|---|---|
| Brand |
Sigma
|
Tamron
|
| Format |
APS-C
|
not listed
|
| Focal length |
17-40mm
|
16-50mm
|
| Max aperture |
f/1.8
1⅓ stops faster
|
f/2.8
|
| Weight |
not listed
|
305 g
|
| Filter thread |
not listed
|
55 mm
|
| Min focus distance |
0.28 m
|
0.15 m
closer
|
| Max magnification |
0.21×
|
0.22×
larger
|
| Aperture blades |
11
more blades
|
7
|
| Optical design |
17 elements / 11 groups
|
14 elements / 10 groups
|
| Weather sealing |
not listed
|
Yes
|
| Released |
not listed
|
2026
|
3 identical specs hidden: mount, type, image stabilization. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Image stabilization
- No both
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.
Our notes
Tamron 16-50mm f/2.8 A
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 Tamron 16-50mm f/2.8 A
wider (15mm) vs 535 g lighter
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 24-105mm F2.8 L IS USM Z vs Tamron 16-50mm f/2.8 A
more reach (105mm) vs 1025 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)
Sigma 18-50mm f/2.8 DC DN Contemporary vs Tamron 16-50mm f/2.8 A
0.36× magnification vs wider (16mm)