Canon RF 28-70mm F2.0 L USM 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 F2.0 L USM if
- You need 1 stop more light for low light or background blur (f/2 vs f/2.8)
- 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: Weddings, portraits, low-light events
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 Canon RF 28-70mm F2.0 L USM does not
- You shoot video: RXD autofocus is smooth and quiet (the Canon RF 28-70mm F2.0 L USM uses USM)
- You shoot close-ups: it focuses down to 0.19 m vs 0.39 m
- You want bigger close-ups: 0.21× vs 0.18× maximum magnification
Spec differences
15 differences| Canon RF 28-70mm F2.0 L USM | 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
|
| Max aperture |
f/2
1 stop faster
|
f/2.8
|
| Weight |
1430 g
|
not listed
|
| Length |
139.8 mm
|
not listed
|
| Diameter |
103.8 mm
|
74.6 mm
slimmer
|
| Filter thread |
95 mm
|
67 mm
|
| Min focus distance |
0.39 m
|
0.19 m
closer
|
| Max magnification |
0.18×
|
0.21×
larger
|
| Optical design |
19 elements / 13 groups
|
16 elements / 12 groups
|
| Autofocus motor |
USM
|
RXD
|
| Image stabilization |
No
|
Yes
stabilized
|
| Weather sealing |
not listed
|
Yes
|
| Released |
2018
|
2026
|
3 identical specs hidden: mount, type, aperture blades. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Aperture blades
- 9 both
Our notes
Canon RF 28-70mm F2.0 L USM
A large-aperture standard zoom for Canon RF full-frame cameras with a constant f/2 aperture. No image stabilization; large and heavy.
Pros
- f/2 across the zoom range
- Replaces several primes
- Weather-sealed L build
Cons
- No image stabilization
- Very heavy (1.43 kg)
- Large 95mm filter thread
Our notes
Tamron 17-70mm f/2.8 Di III-A VC RXD
More comparisons
Canon RF 28-70mm F2.0 L USM vs Sigma 17-40mm f/1.8 DC
more reach (70mm) vs ⅓ stop faster
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 F2.0 L USM vs Sigma 17-40mm F1.8 DC | Art 025
more reach (70mm) vs ⅓ stop faster
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 F2.0 L USM vs Tamron 16-50mm f/2.8 A
1 stop faster vs 1125 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)