Tamron 17-70mm F/2.8 Di III-A VC RXD vs Sigma 50-120mm f/2.8 DC OS Contemporary
Both are Sony E zoom lenses for APS-C. Here is what actually differs.
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
- Our notes say it suits: APS-C walkaround, travel, video
Pick the Sigma 50-120mm f/2.8 DC OS Contemporary if
- You want the lighter lens to carry: 135 g lighter (390 g vs 525 g)
- You need more reach: 120mm vs 70mm at the long end
- You want bigger close-ups: 0.33× vs 0.21× maximum magnification
- You want a compact lens: 99 mm vs 119.3 mm long
- You care about the shape of out-of-focus highlights: 11 aperture blades vs 9
Spec differences
12 differences| Tamron 17-70mm F/2.8 Di III-A VC RXD | Sigma 50-120mm f/2.8 DC OS Contemporary | |
|---|---|---|
| Brand |
Tamron
|
Sigma
|
| Focal length |
17-70mm
|
50-120mm
|
| Weight |
525 g
|
390 g
lighter
|
| Length |
119.3 mm
|
99 mm
shorter
|
| Diameter |
74.6 mm
|
66.8 mm
slimmer
|
| Filter thread |
67 mm
|
55 mm
|
| Min focus distance |
0.19 m
closer
|
0.23 m
|
| Max magnification |
0.21×
|
0.33×
larger
|
| Aperture blades |
9
|
11
more blades
|
| Optical design |
16 elements / 12 groups
|
18 elements / 13 groups
|
| Autofocus motor |
RXD
|
Linear motor
|
| Released |
2021
|
2026
|
6 identical specs hidden: mount, type, format, max aperture, image stabilization, weather sealing. Show all
- Mount
- Sony E both
- Type
- Zoom both
- Format
- APS-C both
- Max aperture
- f/2.8 both
- Image stabilization
- Yes both
- Weather sealing
- Yes both
Our notes
Tamron 17-70mm F/2.8 Di III-A VC RXD
An APS-C standard zoom for Sony E that keeps f/2.8 across 17-70mm and adds VC stabilization. It uses an RXD focus motor.
Pros
- Constant f/2.8 with VC stabilization
- Wide 17-70mm range
- Quiet RXD focus
Cons
- APS-C only
- Larger than a kit zoom
Our notes
Sigma 50-120mm f/2.8 DC OS Contemporary
More comparisons
Sony FE 24-70mm f/2.8 GM vs Tamron 17-70mm F/2.8 Di III-A VC RXD
0.24× magnification vs 361 g lighter
Sony FE 24-70mm f/2.8 GM vs Sigma 50-120mm f/2.8 DC OS Contemporary
wider (24mm) vs 496 g lighter
Sony FE 12-24mm F2.8 GM vs Tamron 17-70mm F/2.8 Di III-A VC RXD
wider (12mm) vs 322 g lighter
Sony FE 70-200mm F2.8 GM OSS II vs Sigma 50-120mm f/2.8 DC OS Contemporary
more reach (200mm) vs 655 g lighter
Tamron 17-70mm F/2.8 Di III-A VC RXD vs Sigma 10-18mm F2.8 DC DN | Contemporary 023
more reach (70mm) vs 270 g lighter
Tamron 17-70mm F/2.8 Di III-A VC RXD vs Sigma 18-50mm F2.8 DC DN | Contemporary 021
wider (17mm) vs 235 g lighter