Compare lenses

Canon RF 70-200mm f/4L IS USM vs Sigma 50-120mm f/2.8 DC OS Contemporary

The Canon RF 70-200mm f/4L IS USM and the Sigma 50-120mm f/2.8 DC OS Contemporary side by side, computed from this guide's catalogue.

Which to pick

Pick the Canon RF 70-200mm f/4L IS USM if you want coverage of full frame, so it suits the larger-sensor bodies too. Pick the Sigma 50-120mm f/2.8 DC OS Contemporary if you want a brighter f/2.8 (1.0 stops more light), for dim light and softer backgrounds; a design for APS-C, which usually means smaller and lighter; a fit on more cameras (90 against 18 in this guide); and a lighter lens (390 g against 695 g).

Still torn? Ask the guide about the Canon RF 70-200mm f/4L IS USM and the Sigma 50-120mm f/2.8 DC OS Contemporary

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Canon RF 70-200mm f/4L IS USM	Sigma 50-120mm f/2.8 DC OS Contemporary
Maker	Canon	Sigma
Focal length	70-200mm (zoom)	50-120mm (zoom)
Full-frame equivalent	70-200mm	75-180mm on APS-C
Maximum aperture	f/4	f/2.8brighter
Made for	Full frame	APS-C
Mounts	Canon RF	Sony E, Fujifilm X, Canon RF
Stabilised	yes	yes
Autofocus	yes	yes
Zoom range	2.9×more range	2.4×
Weight	695 g	390 glighter
Cameras it fits	18 in this guide	90 in this guidefits more cameras

Focal range, in full-frame terms

Canon RF 70-200mm f/4L IS USM: 70-200mm.

Sigma 50-120mm f/2.8 DC OS Contemporary: 50-120mm on APS-C, like 75-180mm.

Aperture

Canon RF 70-200mm f/4L IS USM: f/4 wide open.

Sigma 50-120mm f/2.8 DC OS Contemporary: f/2.8 wide open.

Each opening drawn to scale against f/1.4: a smaller f-number lets in more light and blurs the background more.

Field of view

How wide each sees, at each end, on the sensor it was made for.

Cameras they fit

18 cameras in this guide take both, so either works on the same body. In all, the Canon RF 70-200mm f/4L IS USM fits 18 and the Sigma 50-120mm f/2.8 DC OS Contemporary 90.