Tamron 17-70mm F/2.8 Di III-A VC RXD vs Sigma 28-70mm F2.8 DG DN | Contemporary 021
Both are Sony E zoom lenses. 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 28mm at the wide end
- You shoot handheld in dim light or video: it has optical image stabilization and the Sigma 28-70mm F2.8 DG DN | Contemporary 021 does not
- Our notes say it suits: APS-C walkaround, travel, video
Pick the Sigma 28-70mm F2.8 DG DN | Contemporary 021 if
- You want the lighter lens to carry: 55 g lighter (470 g vs 525 g)
- You want bigger close-ups: 0.3× vs 0.21× maximum magnification
- You shoot full frame: the Tamron 17-70mm F/2.8 Di III-A VC RXD is made for APS-C
- Our notes say it suits: Travel and street, everyday carry, casual events
Spec differences
9 differences| Tamron 17-70mm F/2.8 Di III-A VC RXD | Sigma 28-70mm F2.8 DG DN | Contemporary 021 | |
|---|---|---|
| Brand |
Tamron
|
Sigma
|
| Format |
APS-C
|
Full frame
|
| Focal length |
17-70mm
|
28-70mm
|
| Weight |
525 g
|
470 g
lighter
|
| Length |
119.3 mm
|
103.5 mm
shorter
|
| Diameter |
74.6 mm
|
72.2 mm
slimmer
|
| Max magnification |
0.21×
|
0.3×
larger
|
| Autofocus motor |
RXD
|
Stepping motor
|
| Image stabilization |
Yes
stabilized
|
No
|
9 identical specs hidden: mount, type, max aperture, filter thread, min focus distance, aperture blades, optical design, weather sealing, released. Show all
- Mount
- Sony E both
- Type
- Zoom both
- Max aperture
- f/2.8 both
- Filter thread
- 67 mm both
- Min focus distance
- 0.19 m both
- Aperture blades
- 9 both
- Optical design
- 16 elements / 12 groups both
- Weather sealing
- Yes both
- Released
- 2021 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 28-70mm F2.8 DG DN | Contemporary 021
Compact f/2.8 standard zoom for full-frame mirrorless from Sigma's Contemporary line. It weighs about 470 g and starts at 28mm.
Pros
- Constant f/2.8 in a small body
- Light at about 470 g
- Close focus to 0.19 m
Cons
- Starts at 28mm
- No stabilization
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 28-70mm F2.8 DG DN | Contemporary 021
wider (24mm) vs 416 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 16-35mm F2.8 GM vs Sigma 28-70mm F2.8 DG DN | Contemporary 021
wider (16mm) vs 210 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