Tamron 17-70mm F/2.8 Di III-A VC RXD vs Sigma 18-50mm F2.8 DC DN | Contemporary 021
Side-by-side comparison from our catalogue data. Better values are highlighted only where a clear difference exists.
Verdict at a glance
- Tamron 17-70mm F/2.8 Di III-A VC RXD goes wider (17mm vs 18mm).
- Tamron 17-70mm F/2.8 Di III-A VC RXD reaches further (70mm vs 50mm).
| Spec | 17-70mm F/2.8 Di III-A VC RXD | 18-50mm F2.8 DC DN | Contemporary 021 |
|---|---|---|
| Brand | Tamron | Sigma |
| Mount | Sony E | Sony E |
| Type | Zoom | Zoom |
| Focal length | 17-70mm (wider) | 18-50mm |
| Max aperture | f/2.8 | f/2.8 |
| Blades | n/a | 7 |
| Format | n/a | aps-c |
| Groups | n/a | 10 |
| Af motor | n/a | Stepping motor |
| Elements | n/a | 13 |
| Weight g | n/a | 290 |
| Filter mm | n/a | 55 |
| Length mm | n/a | 76.5 |
| Diameter mm | n/a | 61.6 |
| Min focus m | n/a | 0.121 |
| Max magnification | n/a | 0.36 |
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
Sigma 18-50mm F2.8 DC DN | Contemporary 021
A compact f/2.8 standard zoom for APS-C E-mount cameras, weighing about 290 g. It takes 55mm filters and offers a close focus distance of 0.121 m.
Pros
- Constant f/2.8
- Very light at 290 g
- Close focus 0.121 m
- Stepping motor autofocus
Cons
- APS-C only
- No stabilization in the lens
- Less range than a kit zoom