Compare lenses

Leica Summicron-TL 23mm f/2 ASPH vs Sigma 23mm f/1.4 DC DN Contemporary

The Leica Summicron-TL 23mm f/2 ASPH and the Sigma 23mm f/1.4 DC DN Contemporary side by side, computed from this guide's catalogue.

Which to pick

Pick the Leica Summicron-TL 23mm f/2 ASPH if you want a lighter lens (154 g against 330 g). Pick the Sigma 23mm f/1.4 DC DN Contemporary if you want a brighter f/1.4 (1.0 stops more light), for dim light and softer backgrounds and a fit on more cameras (115 against 25 in this guide).

Still torn? Ask the guide about the Leica Summicron-TL 23mm f/2 ASPH and the Sigma 23mm 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	Leica Summicron-TL 23mm f/2 ASPH	Sigma 23mm f/1.4 DC DN Contemporary
Maker	Leica	Sigma
Focal length	23mm (prime)	23mm (prime)
Full-frame equivalent	34mm on APS-C	34mm on APS-C
Maximum aperture	f/2	f/1.4brighter
Made for	APS-C	APS-C
Mounts	L-Mount	Sony E, Fujifilm X, L-Mount, Canon RF
Stabilised	no	no
Autofocus	yes	yes
Weight	154 glighter	330 g
Cameras it fits	25 in this guide	115 in this guidefits more cameras

Focal range, in full-frame terms

Leica Summicron-TL 23mm f/2 ASPH: 23mm on APS-C, like 34mm.

Sigma 23mm f/1.4 DC DN Contemporary: 23mm on APS-C, like 34mm.

Aperture

Leica Summicron-TL 23mm f/2 ASPH: f/2 wide open.

Sigma 23mm 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

25 cameras in this guide take both, so either works on the same body. In all, the Leica Summicron-TL 23mm f/2 ASPH fits 25 and the Sigma 23mm f/1.4 DC DN Contemporary 115.