Sigma 18-50mm f/2.8 DC DN Contemporary vs Tamron 17-70mm f/2.8 Di III-A VC RXD
Both are Canon RF zoom lenses for APS-C. Here is what actually differs.
Pick the Sigma 18-50mm f/2.8 DC DN Contemporary if
- You want bigger close-ups: 0.36× vs 0.21× maximum magnification
Pick the Tamron 17-70mm f/2.8 Di III-A VC RXD if
- You want a wider view: 17mm vs 18mm at the wide end
- You need more reach: 70mm vs 50mm at the long end
- You shoot handheld in dim light or video: it has optical image stabilization and the Sigma 18-50mm f/2.8 DC DN Contemporary does not
- You care about the shape of out-of-focus highlights: 9 aperture blades vs 7
- You prefer a newer design: released 2026 vs 2021
Spec differences
14 differences| Sigma 18-50mm f/2.8 DC DN Contemporary | Tamron 17-70mm f/2.8 Di III-A VC RXD | |
|---|---|---|
| Brand |
Sigma
|
Tamron
|
| Focal length |
18-50mm
|
17-70mm
|
| Weight |
300 g
|
not listed
|
| Length |
74.5 mm
|
not listed
|
| Diameter |
69.2 mm
slimmer
|
74.6 mm
|
| Filter thread |
55 mm
|
67 mm
|
| Min focus distance |
not listed
|
0.19 m
|
| Max magnification |
0.36×
larger
|
0.21×
|
| Aperture blades |
7
|
9
more blades
|
| Optical design |
not listed
|
16 elements / 12 groups
|
| Autofocus motor |
Stepping motor
|
RXD
|
| Image stabilization |
No
|
Yes
stabilized
|
| Weather sealing |
not listed
|
Yes
|
| Released |
2021
|
2026
|
4 identical specs hidden: mount, type, format, max aperture. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Format
- APS-C both
- Max aperture
- f/2.8 both
More comparisons
Canon RF 15-35mm F2.8 L IS USM vs Sigma 18-50mm f/2.8 DC DN Contemporary
wider (15mm) vs 540 g lighter
Canon RF 15-35mm F2.8 L IS USM vs Tamron 17-70mm f/2.8 Di III-A VC RXD
wider (15mm) vs more reach (70mm)
Canon RF 24-105mm F2.8 L IS USM Z vs Sigma 18-50mm f/2.8 DC DN Contemporary
more reach (105mm) vs 1030 g lighter
Canon RF 24-105mm F2.8 L IS USM Z vs Tamron 17-70mm f/2.8 Di III-A VC RXD
more reach (105mm) vs wider (17mm)
Sigma 18-50mm f/2.8 DC DN Contemporary vs Tamron 11-20mm f/2.8 Di III-A RXD
more reach (50mm) 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)