Sigma 20mm f/2 DG Contemporary

This page is a summary. For anything more specific, ask: /ask/what-is-the-sigma-20mm-f-2-dg-contemporary-good-for, or any question as words after /ask/.

Prime lens

A prime lens by Sigma for Full frame cameras, 20mm f/2. A small metal ultra-wide from the I series; sold as the 20mm f/2 DG DN Contemporary before 2025.

Maker	Sigma
Focal length	20mm (prime)
Maximum aperture	f/2
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 20mm sees on each sensor it covers.

f/2 wide open, to scale against f/1.4.

On full frame (Sony E, L-Mount): as marked, 20mm.
On APS-C (Sony E, L-Mount): like 30mm on full frame; f/2 gives about the depth of field of f/3 there.