Compare lenses

Sigma 17-40mm f/1.8 DC Art vs Sony FE 28-70mm f/2 GM

The Sigma 17-40mm f/1.8 DC Art and the Sony FE 28-70mm f/2 GM side by side, computed from this guide's catalogue.

Which to pick

Pick the Sigma 17-40mm f/1.8 DC Art if you want a brighter f/1.8 (0.3 stops more light), for dim light and softer backgrounds; a design for APS-C, which usually means smaller and lighter; a fit on more cameras (115 against 41 in this guide); and a lighter lens (525 g against 918 g). Pick the Sony FE 28-70mm f/2 GM if you want more reach (to 70mm equivalent) and coverage of full frame, so it suits the larger-sensor bodies too.

Still torn? Ask the guide about the Sigma 17-40mm f/1.8 DC Art and the Sony FE 28-70mm f/2 GM

Specs side by side

Rows that differ are in full colour; the better value is marked where one is better by any measure.
Spec	Sigma 17-40mm f/1.8 DC Art	Sony FE 28-70mm f/2 GM
Maker	Sigma	Sony
Focal length	17-40mm (zoom)	28-70mm (zoom)
Full-frame equivalent	26-60mm on APS-C	28-70mm
Maximum aperture	f/1.8brighter	f/2
Made for	APS-C	Full frame
Mounts	Sony E, Fujifilm X, L-Mount, Canon RF	Sony E
Stabilised	no	no
Autofocus	yes	yes
Zoom range	2.4×	2.5×
Weight	525 glighter	918 g
Cameras it fits	115 in this guidefits more cameras	41 in this guide

Focal range, in full-frame terms

Sigma 17-40mm f/1.8 DC Art: 17-40mm on APS-C, like 26-60mm.

Sony FE 28-70mm f/2 GM: 28-70mm.

Aperture

Sigma 17-40mm f/1.8 DC Art: f/1.8 wide open.

Sony FE 28-70mm f/2 GM: f/2 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 Sigma 17-40mm f/1.8 DC Art fits 115 and the Sony FE 28-70mm f/2 GM 41.