Canon EF 75–300mm lens - Wikipedia, the free encyclopedia Introduced in 1995, the Canon EF 75–300mm lens f /4–5.6 is a telephoto zoom lens for Canon EOS single-lens reflex cameras with an EF lens mount. There are 3 basic types of the lens: the IS USM (Image Stabilization, Ultra Sonic Motor), the USM (USM, no IS)