Canon EF 75-300mm f/4-5.6 III camera lens

Telephoto zoom for Canon EF cameras

The Canon EF 75-300mm f/4-5.6 III is a 4x telephoto zoom lens designed for Canon digital SLR cameras using the EF mount. It covers focal lengths from 75 mm to 300 mm, making it suitable for portraiture, sports and other distant subjects. The lens uses a DC micro motor to deliver autofocus performance in a lightweight, compact black barrel. It is a new unit aimed at photographers wanting extended reach on an EF system.

Variable aperture limits low-light use

The maximum aperture ranges from f/4 at 75 mm to f/5.6 at 300 mm, so less light reaches the sensor as you zoom in. This variable aperture restricts shutter speeds in dim conditions and limits shallow depth-of-field control at the long end. A Super Spectra coating on the elements reduces flare and ghosting for better contrast, while a seven-blade diaphragm produces smooth bokeh when stopping down. No image stabilisation is mentioned in the specifications.

Check mount and focus expectations

Verify that your camera uses the Canon EF mount, as this lens will not fit EF-M or RF bodies without an adapter. The DC micro motor drives autofocus but may not be as quiet or fast as ultrasonic alternatives. Ensure your shooting style tolerates the variable aperture and lack of stabilisation, especially for handheld work at 300 mm. Buyers needing wider angles, constant apertures or weather sealing should consider other options.