Compare lenses

Canon RF 15-35mm f/2.8L IS USM vs Canon RF 20-50mm f/4L IS USM PZ

The Canon RF 15-35mm f/2.8L IS USM and the Canon RF 20-50mm f/4L IS USM PZ side by side, computed from this guide's catalogue.

Which to pick

Pick the Canon RF 15-35mm f/2.8L IS USM if you want a brighter f/2.8 (1.0 stops more light), for dim light and softer backgrounds and a wider view (from 15mm equivalent). Pick the Canon RF 20-50mm f/4L IS USM PZ if you want more reach (to 50mm equivalent) and a lighter lens (420 g against 840 g).

Still torn? Ask the guide about the Canon RF 15-35mm f/2.8L IS USM and the Canon RF 20-50mm f/4L IS USM PZ

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 15-35mm f/2.8L IS USM	Canon RF 20-50mm f/4L IS USM PZ
Maker	Canon	Canon
Focal length	15-35mm (zoom)	20-50mm (zoom)
Full-frame equivalent	15-35mm	20-50mm
Maximum aperture	f/2.8brighter	f/4
Made for	Full frame	Full frame
Mounts	Canon RF	Canon RF
Stabilised	yes	yes
Autofocus	yes	yes
Zoom range	2.3×	2.5×
Weight	840 g	420 glighter
Cameras it fits	18 in this guide	18 in this guide

Focal range, in full-frame terms

Canon RF 15-35mm f/2.8L IS USM: 15-35mm.

Canon RF 20-50mm f/4L IS USM PZ: 20-50mm.

Aperture

Canon RF 15-35mm f/2.8L IS USM: f/2.8 wide open.

Canon RF 20-50mm f/4L IS USM PZ: f/4 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.