Canon EF 300mm F 4L IS USM Review | 54 Data compared

The Canon EF 300mm f/4.0 L IS USM is a legendary prime telephoto lens praised for its exceptional image quality and robust build quality at an attractive price point compared to exotic super-telephotos. Weighing 1,190 grams, this reasonably compact lens features an innovative integrated sliding lens hood that deploys by pulling and screwing it into place, a highly efficient image stabilization (IS) system with two distinct modes, and a fast, quiet Ultra Sonic Motor (USM) autofocus system that supports full-time manual focus override. It is highly versatile, proving excellent for sports, wildlife, landscapes, and even close-up "proxiphotography" due to its remarkably short minimum focusing distance of just 1.5 meters. Additionally, it maintains full autofocus capabilities when paired with an EF 1.4x extender (becoming a 420mm f/5.6 lens), making it an adaptable alternative to heavier gear. However, the lens does have notable ergonomic and physical drawbacks. Its minimal tripod collar is uncomfortable for hand-held shooting and cannot be detached unless the lens is completely removed from the camera body. The provided semi-rigid carrying case is also criticized as impractical with a...

The Canon EF 300mm f/4L IS USM is a professional-grade (L-series) telephoto lens released in March 1997 that provides a 480mm equivalent focal length when mounted on an APS-C sensor camera. Built with an entirely metallic body, 15 lens elements in 11 groups (including 2 UD elements), and an 8-blade diaphragm, it delivers impressive, heavy-duty build quality paired with a highly practical sliding integrated lens hood. Optically, the lens is highly praised for producing great sharpness starting right at its maximum f/4 aperture, reaching peak performance at f/5.6, while keeping optical defects like chromatic aberration and vignetting nearly nonexistent. Additionally, it offers surprising versatility, proving excellent not just for wildlife and sports photography, but also for close-up (proxy) photography due to its short 1.5-meter minimum focusing distance. However, because of its older design, the lens does suffer from a few notable drawbacks. Its built-in image stabilization only provides up to 2 stops of compensation and is reportedly quite noisy during operation. The ring-type USM autofocus motor, while generally quiet and smooth, is noticeably slower than the autofocus systems found in...

The DXOMARK evaluation of the Canon EF 300mm f/4L IS USM highlights it as a highly capable super-telephoto prime lens, offering a great balance of performance and value compared to its more expensive f/2.8 siblings. Originally launched in March 1997, it remains a robust option for wildlife and sports photography. On high-resolution camera bodies like the Canon EOS 5DS R, the lens achieves a respectable sharpness metric of 18 P-Mpix. A major standout feature in DXOMARK's measurements is its exceptional control over geometric distortion, yielding a near-perfect score of 0.2%. Additionally, vignetting is very well managed, dipping to a minimal -0.8 EV, ensuring relatively even frame illumination even when shooting wide open. However, the review also highlights several compromises that reveal the lens's older optical design age. Its primary drawback is its susceptibility to chromatic aberration, with measurements reaching 6 µm, which typically manifests as noticeable blue fringing around high-contrast edges or star fields. There is also a slight compromise in light transmission, as it drops to a measured 4.6 T-stop when wide open at f/4, meaning it lets in...

The Canon EF 300mm f/4L IS USM is a fixed telephoto lens belonging to Canon's premium "L" series, highly recommended for wildlife, sports, and alternative portrait photography. Optically, it inherits elite performance from its predecessor, delivering superb image quality and sharpness from its maximum aperture across the entire frame, with zero distortion and minimal vignetting. Its standout features include a built-in image stabilizer that allows sharp handheld shooting at speeds down to 1/100th of a second, an incredibly short 1.5-meter minimum focus distance perfect for close-up photography, and a highly precise, fast autofocus that excels in AI Servo mode. Additionally, the lens comes well-equipped with a tripod collar and a highly practical built-in lens hood that slides out from the barrel. On the downside, the lens presents a few notable drawbacks, starting with its price of approximately €1,350 new, which represents a steep investment for beginners and enthusiast photographers. A focal length of 300mm can also feel a bit short for small wildlife, such as birds, and the maximum aperture of f/4 may force users to increase their ISO settings...