Sigma 50-120mm f/2.8 DC OS 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 50-120mm f/2.8 DC OS Contemporary if
- You need more reach: 120mm vs 70mm at the long end
- You want bigger close-ups: 0.33× vs 0.21× maximum magnification
- You care about the shape of out-of-focus highlights: 11 aperture blades vs 9
Pick the Tamron 17-70mm f/2.8 Di III-A VC RXD if
- You want a wider view: 17mm vs 50mm at the wide end
- You shoot close-ups: it focuses down to 0.19 m vs 0.23 m
Spec differences
11 differences| Sigma 50-120mm f/2.8 DC OS Contemporary | Tamron 17-70mm f/2.8 Di III-A VC RXD | |
|---|---|---|
| Brand |
Sigma
|
Tamron
|
| Focal length |
50-120mm
|
17-70mm
|
| Weight |
410 g
|
not listed
|
| Length |
97 mm
|
not listed
|
| Diameter |
69 mm
slimmer
|
74.6 mm
|
| Filter thread |
55 mm
|
67 mm
|
| Min focus distance |
0.23 m
|
0.19 m
closer
|
| Max magnification |
0.33×
larger
|
0.21×
|
| Aperture blades |
11
more blades
|
9
|
| Optical design |
18 elements / 13 groups
|
16 elements / 12 groups
|
| Autofocus motor |
Linear motor
|
RXD
|
7 identical specs hidden: mount, type, format, max aperture, image stabilization, weather sealing, released. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Format
- APS-C both
- Max aperture
- f/2.8 both
- Image stabilization
- Yes both
- Weather sealing
- Yes both
- Released
- 2026 both
More comparisons
Canon RF 24-105mm F2.8 L IS USM Z vs Sigma 50-120mm f/2.8 DC OS Contemporary
wider (24mm) vs 920 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 28-70mm F2.8 IS STM vs Sigma 50-120mm f/2.8 DC OS Contemporary
wider (28mm) vs 85 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 50-120mm f/2.8 DC OS Contemporary vs Tamron 16-50mm f/2.8 A
more reach (120mm) vs 105 g lighter
Sigma 18-50mm f/2.8 DC DN Contemporary vs Tamron 17-70mm f/2.8 Di III-A VC RXD
0.36× magnification vs wider (17mm)