Canon RF 28-70mm F2.8 IS STM vs Tamron 17-70mm f/2.8 Di III-A VC RXD
Both are Canon RF zoom lenses. Here is what actually differs.
Pick the Canon RF 28-70mm F2.8 IS STM if
- You want bigger close-ups: 0.24× 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: Everyday photography, travel, video
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 close-ups: it focuses down to 0.19 m vs 0.27 m
- You prefer a newer design: released 2026 vs 2024
Spec differences
12 differences| Canon RF 28-70mm F2.8 IS STM | Tamron 17-70mm f/2.8 Di III-A VC RXD | |
|---|---|---|
| Brand |
Canon
|
Tamron
|
| Format |
Full frame
|
APS-C
|
| Focal length |
28-70mm
|
17-70mm
|
| Weight |
495 g
|
not listed
|
| Length |
92.2 mm
|
not listed
|
| Diameter |
76.5 mm
|
74.6 mm
|
| Min focus distance |
0.27 m
|
0.19 m
closer
|
| Max magnification |
0.24×
larger
|
0.21×
|
| Optical design |
15 elements / 12 groups
|
16 elements / 12 groups
|
| Autofocus motor |
STM
|
RXD
|
| Weather sealing |
not listed
|
Yes
|
| Released |
2024
|
2026
|
6 identical specs hidden: mount, type, max aperture, filter thread, aperture blades, image stabilization. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Max aperture
- f/2.8 both
- Filter thread
- 67 mm both
- Aperture blades
- 9 both
- Image stabilization
- Yes both
Our notes
Canon RF 28-70mm F2.8 IS STM
A compact f/2.8 standard zoom for Canon RF full-frame cameras with stabilization and stepping-motor autofocus.
Pros
- Constant f/2.8
- Small and light (495 g)
- Image stabilization
Cons
- Starts at 28mm
- Narrower range than a 24-70
- Relies on digital corrections
Our notes
Tamron 17-70mm f/2.8 Di III-A VC RXD
More comparisons
Canon RF 28-70mm F2.8 IS STM vs Sigma 18-50mm f/2.8 DC DN Contemporary
more reach (70mm) vs 195 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)
Canon RF 28-70mm F2.8 IS STM vs Tamron 16-50mm f/2.8 A
more reach (70mm) vs 190 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)