Compare lenses

Samyang AF 18mm f/2.8 FE vs Sigma 17mm f/4 DG Contemporary

The Samyang AF 18mm f/2.8 FE and the Sigma 17mm f/4 DG Contemporary side by side, computed from this guide's catalogue.

Which to pick

Pick the Samyang AF 18mm f/2.8 FE if you want a brighter f/2.8 (1.0 stops more light), for dim light and softer backgrounds and a lighter lens (145 g against 220 g). Pick the Sigma 17mm f/4 DG Contemporary if you want a fit on more cameras (66 against 41 in this guide).

Still torn? Ask the guide about the Samyang AF 18mm f/2.8 FE and the Sigma 17mm f/4 DG 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	Samyang AF 18mm f/2.8 FE	Sigma 17mm f/4 DG Contemporary
Maker	Samyang	Sigma
Focal length	18mm (prime)	17mm (prime)
Full-frame equivalent	18mm	17mm
Maximum aperture	f/2.8brighter	f/4
Made for	Full frame	Full frame
Mounts	Sony E	Sony E, L-Mount
Stabilised	no	no
Autofocus	yes	yes
Weight	145 glighter	220 g
Cameras it fits	41 in this guide	66 in this guidefits more cameras

Focal range, in full-frame terms

Samyang AF 18mm f/2.8 FE: 18mm.

Sigma 17mm f/4 DG Contemporary: 17mm.

Aperture

Samyang AF 18mm f/2.8 FE: f/2.8 wide open.

Sigma 17mm f/4 DG Contemporary: 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

41 cameras in this guide take both, so either works on the same body. In all, the Samyang AF 18mm f/2.8 FE fits 41 and the Sigma 17mm f/4 DG Contemporary 66.