Is the canon ef 300mm f 4l is usm good on aps c?

Here is what the site says about that.

From Canon EF 300mm f/4L IS USM: Canon EF 300mm f/4L IS USM: A prime lens by Canon for Full frame cameras, 300mm f/4. Specs - Maker: Canon - Focal length: 300mm (prime) - Maximum aperture: f/4 - Made for: Full frame sensors - Mounts: Canon EF - Stabilised: yes - Autofocus: yes What it frames like - On full frame (Canon EF): as marked, 300mm. - On APS-C (Canon) (Canon EF): like 480mm on full frame; f/4 gives about the depth of ...

From Sensor sizes: Crop factor and field of view: Multiply a lens's focal length by the crop factor to get the full-frame equivalent view. A 35mm lens on APS-C frames like a 50mm on full frame. A 300mm lens on Micro Four Thirds frames like a 600mm. That's why smaller sensors are popular for wildlife: the same reach in a smaller, cheaper kit. The focal length converter does the sums for any pair of formats.

Quoted from this site's pages.