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Rent NowThe Canon EF 75-300mm f/4-5.6 III is an affordable telephoto zoom lens designed for Canon EF-mount cameras, offering an easy way to extend reach for wildlife, sports, and general telephoto shooting without a significant investment. Compatible with both full-frame and APS-C Canon DSLRs, it’s a straightforward, lightweight option for photographers adding telephoto versatility to their kit at low cost.
Optically, the lens features a 13-element, 9-group construction covering a 75-300mm focal range, giving a variable maximum aperture of f/4 at the wide end and f/5.6 at full telephoto. On APS-C bodies, the effective focal range extends further due to the crop factor, making it useful for reaching distant subjects. The lens uses a 7-blade aperture diaphragm, contributing to background blur when shooting at wider apertures, particularly toward the longer end of the zoom range.
Autofocus is driven by the camera body’s built-in focus motor rather than an internal ultrasonic or stepping motor, as this “III” version does not include its own AF drive system, unlike the USM-equipped variant of this lens. This keeps the lens simple and lightweight, but focus speed and quietness depend on the host camera body rather than the lens itself.
Handling is simple and lightweight, with a compact barrel design and a 58mm filter thread for attaching filters. The lens has a minimum focusing distance of about 1.2m, yielding a maximum magnification of 0.25x, which allows for modest close-up work in addition to standard telephoto shooting.
As an entry-level telephoto zoom, the EF 75-300mm f/4-5.6 III does not include image stabilization or weather sealing, so photographers should account for faster shutter speeds when shooting handheld at longer focal lengths, especially in lower light. Its variable aperture also means less light-gathering capability as you zoom toward 300mm, a typical tradeoff for lenses in this price and size class. Despite these limitations, it remains a popular choice for photographers wanting basic telephoto reach for outdoor, travel, or casual sports photography without adding significant bulk or cost to their setup.
Key Features
– 75-300mm telephoto zoom for Canon EF mount
– Maximum aperture f/4-5.6 (variable)
– Autofocus driven by camera body motor (no internal AF motor)
– 13 elements in 9 groups optical construction
– Minimum focusing distance of approximately 1.2m
– Maximum magnification of 0.25x
– 7-blade aperture diaphragm
– 58mm filter thread
– Compatible with full-frame and APS-C Canon EF-mount cameras
