Canon RF 28-70mm F2.8 IS STM vs Sigma 50-120mm f/2.8 DC OS Contemporary
Both are Canon RF zoom lenses. Here is what actually differs.
Pick the Canon RF 28-70mm F2.8 IS STM if
- You want a wider view: 28mm vs 50mm at the wide end
- You shoot full frame: the Sigma 50-120mm f/2.8 DC OS Contemporary is made for APS-C
- Our notes say it suits: Everyday photography, travel, video
Pick the Sigma 50-120mm f/2.8 DC OS Contemporary if
- You want the lighter lens to carry: 85 g lighter (410 g vs 495 g)
- You need more reach: 120mm vs 70mm at the long end
- You shoot close-ups: it focuses down to 0.23 m vs 0.27 m
- You want bigger close-ups: 0.33× vs 0.24× maximum magnification
- You care about the shape of out-of-focus highlights: 11 aperture blades vs 9
Spec differences
14 differences| Canon RF 28-70mm F2.8 IS STM | Sigma 50-120mm f/2.8 DC OS Contemporary | |
|---|---|---|
| Brand |
Canon
|
Sigma
|
| Format |
Full frame
|
APS-C
|
| Focal length |
28-70mm
|
50-120mm
|
| Weight |
495 g
|
410 g
lighter
|
| Length |
92.2 mm
shorter
|
97 mm
|
| Diameter |
76.5 mm
|
69 mm
slimmer
|
| Filter thread |
67 mm
|
55 mm
|
| Min focus distance |
0.27 m
|
0.23 m
closer
|
| Max magnification |
0.24×
|
0.33×
larger
|
| Aperture blades |
9
|
11
more blades
|
| Optical design |
15 elements / 12 groups
|
18 elements / 13 groups
|
| Autofocus motor |
STM
|
Linear motor
|
| Weather sealing |
not listed
|
Yes
|
| Released |
2024
|
2026
|
4 identical specs hidden: mount, type, max aperture, image stabilization. Show all
- Mount
- Canon RF both
- Type
- Zoom both
- Max aperture
- f/2.8 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
Sigma 50-120mm f/2.8 DC OS Contemporary
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 24-105mm F2.8 L IS USM Z vs Sigma 50-120mm f/2.8 DC OS Contemporary
wider (24mm) vs 920 g lighter
Canon RF 28-70mm F2.8 IS STM vs Tamron 16-50mm f/2.8 A
more reach (70mm) vs 190 g lighter
Sigma 50-120mm f/2.8 DC OS Contemporary vs Tamron 16-50mm f/2.8 A
more reach (120mm) vs 105 g lighter
Canon RF 28-70mm F2.8 IS STM vs Tamron 17-70mm f/2.8 Di III-A VC RXD
0.24× magnification vs wider (17mm)
Sigma 50-120mm f/2.8 DC OS Contemporary vs Tamron 17-70mm f/2.8 Di III-A VC RXD
more reach (120mm) vs wider (17mm)