Compare lenses

Canon RF 45mm f/1.2 STM vs Sigma 30mm f/1.4 DC DN Contemporary

The Canon RF 45mm f/1.2 STM and the Sigma 30mm f/1.4 DC DN Contemporary side by side, computed from this guide's catalogue.

Which to pick

Pick the Canon RF 45mm f/1.2 STM if you want a brighter f/1.2 (0.4 stops more light), for dim light and softer backgrounds and coverage of full frame, so it suits the larger-sensor bodies too. Pick the Sigma 30mm f/1.4 DC DN Contemporary if you want a design for APS-C, which usually means smaller and lighter; a fit on more cameras (180 against 18 in this guide); and a lighter lens (265 g against 346 g).

Still torn? Ask the guide about the Canon RF 45mm f/1.2 STM and the Sigma 30mm f/1.4 DC DN 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 45mm f/1.2 STM	Sigma 30mm f/1.4 DC DN Contemporary
Maker	Canon	Sigma
Focal length	45mm (prime)	30mm (prime)
Full-frame equivalent	45mm	45mm on APS-C
Maximum aperture	f/1.2brighter	f/1.4
Made for	Full frame	APS-C
Mounts	Canon RF	Sony E, Fujifilm X, Micro Four Thirds, L-Mount, Canon RF, Nikon Z
Stabilised	no	no
Autofocus	yes	yes
Weight	346 g	265 glighter
Cameras it fits	18 in this guide	180 in this guidefits more cameras

Focal range, in full-frame terms

Canon RF 45mm f/1.2 STM: 45mm.

Sigma 30mm f/1.4 DC DN Contemporary: 30mm on APS-C, like 45mm.

Aperture

Canon RF 45mm f/1.2 STM: f/1.2 wide open.

Sigma 30mm f/1.4 DC DN Contemporary: f/1.4 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. In all, the Canon RF 45mm f/1.2 STM fits 18 and the Sigma 30mm f/1.4 DC DN Contemporary 180.