Sigma 45mm f/2.8 DG Contemporary

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Prime lens

A prime lens by Sigma for Full frame cameras, 45mm f/2.8. A small metal standard prime with a soft, classic look wide open; sold as the 45mm f/2.8 DG DN before 2025.

Maker	Sigma
Focal length	45mm (prime)
Maximum aperture	f/2.8
Made for	Full frame sensors
Mounts	Sony E, L-Mount
Stabilised	no
Autofocus	yes

What it frames like

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

How wide 45mm sees on each sensor it covers.

f/2.8 wide open, to scale against f/1.4.

On full frame (Sony E, L-Mount): as marked, 45mm.
On APS-C (Sony E, L-Mount): like 68mm on full frame; f/2.8 gives about the depth of field of f/4.2 there.