Tamron 20-40mm f/2.8 Di III VXD

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Zoom lens

A zoom lens by Tamron for Full frame cameras, 20-40mm f/2.8.

What it frames like

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

How wide 20mm sees at its wide end on each sensor it covers.

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

On full frame (Sony E, Nikon Z): as marked, 20-40mm.
On APS-C (Sony E, Nikon Z): like 30-60mm on full frame; f/2.8 gives about the depth of field of f/4.2 there.