Sigma 17-40mm f/1.8 DC Art

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Zoom lens

A zoom lens by Sigma for APS-C cameras, 17-40mm f/1.8. A constant f/1.8 standard zoom for APS-C mirrorless, in the spirit of the 18-35mm f/1.8 for DSLRs.

Maker	Sigma
Focal length	17-40mm (zoom)
Maximum aperture	f/1.8
Made for	APS-C sensors
Mounts	Sony E, Fujifilm X, L-Mount, Canon RF
Stabilised	no
Autofocus	yes

What it frames like

Its full-frame-equivalent focal length on the sensor it was made for.

How wide 17mm sees at its wide end on each sensor it covers.

f/1.8 wide open, to scale against f/1.4.

On APS-C (Sony E, Fujifilm X, L-Mount): like 26-60mm on full frame; f/1.8 gives about the depth of field of f/2.7 there.
On APS-C (Canon) (Canon RF): like 27-64mm on full frame; f/1.8 gives about the depth of field of f/2.9 there.
On the larger-sensor bodies of Canon RF, L-Mount, Sony E: it works with the camera in a APS-C crop mode, at fewer megapixels.