Canon EF 8-15mm f/4L Fisheye USM

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Zoom lens

A zoom lens by Canon for Full frame cameras, 8-15mm f/4.

What it frames like

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

How wide 8mm sees at its wide end on each sensor it covers.

f/4 wide open, to scale against f/1.4.

On full frame (Canon EF): as marked, 8-15mm.
On APS-C (Canon) (Canon EF): like 13-24mm on full frame; f/4 gives about the depth of field of f/6.4 there.