Compare lenses

Canon RF 10-20mm f/4L IS STM vs Canon RF 7-14mm f/2.8-3.5L Fisheye STM

The Canon RF 10-20mm f/4L IS STM and the Canon RF 7-14mm f/2.8-3.5L Fisheye STM side by side, computed from this guide's catalogue.

Which to pick

Pick the Canon RF 10-20mm f/4L IS STM if you want optical stabilisation, which helps most on bodies without it and more reach (to 20mm equivalent). Pick the Canon RF 7-14mm f/2.8-3.5L Fisheye STM if you want a brighter f/2.8 (1.0 stops more light), for dim light and softer backgrounds; a wider view (from 7mm equivalent); and a lighter lens (476 g against 570 g).

Still torn? Ask the guide about the Canon RF 10-20mm f/4L IS STM and the Canon RF 7-14mm f/2.8-3.5L Fisheye STM

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 10-20mm f/4L IS STM	Canon RF 7-14mm f/2.8-3.5L Fisheye STM
Maker	Canon	Canon
Focal length	10-20mm (zoom)	7-14mm (zoom)
Full-frame equivalent	10-20mm	7-14mm
Maximum aperture	f/4	f/2.8-3.5brighter
Made for	Full frame	Full frame
Mounts	Canon RF	Canon RF
Stabilised	yesstabilised	no
Autofocus	yes	yes
Zoom range	2.0×	2.0×
Weight	570 g	476 glighter
Cameras it fits	18 in this guide	18 in this guide

Focal range, in full-frame terms

Canon RF 10-20mm f/4L IS STM: 10-20mm.

Canon RF 7-14mm f/2.8-3.5L Fisheye STM: 7-14mm.

Aperture

Canon RF 10-20mm f/4L IS STM: f/4 wide open.

Canon RF 7-14mm f/2.8-3.5L Fisheye STM: 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.