Canon 75-300mm f4.0-5.6 III USM is an Auto Focus (AF)
Telephoto Zoom lens with 35mm FF max sensor coverage and it is designed to be used with Canon EF mount cameras.
Lenses in Canon EF Mount with Same Focal and Aperture Range
Lens Mount
Canon 75-300mm f4.0-5.6 III USM is compatible with cameras that have Canon EF lens mount.Some of the latest released cameras with Canon EF lens mount are
Canon 1D X III,
Canon 6D MII and
Canon 5D MIV.
Sensor Coverage
Max sensor coverage of Canon 75-300mm f4.0-5.6 III USM is 35mm FF.
Focal Range
Canon 75-300mm f4.0-5.6 III USM has a focal range of 75-300mm and 4.0X zoom ratio. When it is mounted on an APS-C sensor camera with 1.6x crop, it provides an 35mm (FF) equivalent of 120 - 480mm.
Optical Image Stabilization
Canon 75-300mm f4.0-5.6 III USM doesn't have an optical image stabilization system so the only option to stabilize the image taken with this lens is to mount on a camera body with IBIS (sensor based In-body image stabilization).
Body Colour
Canon 75-300mm f4.0-5.6 III USM is available in Black color.
Zoom Method
Canon 75-300mm f4.0-5.6 III USM features Rotary (extending) zoom method where the length of the lens changes as you zoom in or out. This makes it possible to design the lens with a smaller minimum length ( generally when it is zoomed out) compared to internal zoom lenses. The disadvantages of this design are being harder to seal against dust and moisture, weight balance shifting while zooming and zoom creep in certain lenses.
Aperture
Canon 75-300mm f4.0-5.6 III USM is a variable aperture lens with a max aperture of f4 and a minimum aperture of f32 at 75mm, and a max aperture of f5.6 and minimum aperture of f45 at 300mm .
Optical Formula
Canon 75-300mm f4.0-5.6 III USM's optical formula consists of 13 elements in 9 groups.