What is equivalent zoom for 300mm lens?

The equivalent zoom of a 300mm lens depends on the camera's sensor size. For a full-frame (35mm) camera, a 300mm lens provides a 300mm focal length. However, on an APS-C sensor camera, which has a crop factor of about 1.5x, the equivalent zoom would be approximately 450mm. Similarly, on a Micro Four Thirds camera with a 2x crop factor, it would equate to about 600mm.