Canon's versatile EF 600-millimeter f/4L Image Stabilization III UltraSonic Motor Lens allows for the action to be brought up close and clear in almost any situation. This autofocus telephoto prime lens is part of Canon's L series, making it a must have for professional and advanced photographers. The autofocus feature is fast, and makes the lens great for capturing fast-moving subjects such as animals and athletes. The EF 600-millimeter lens also works very well in low light conditions, experiencing little to no noise interference. Photographers will appreciate the ability to work handheld in low light conditions because of how sharp the image quality is. Weather should not be a concern with this lens since it is weather sealed against dust and moisture, making it an ideal lens for outdoor use. The lens even has heat-rejecting paint and a two-layer barrel structure, allowing for all day shooting outdoors, even in hot weather.

The EF 600-millimeter f/4L Image Stabilization III UltraSonic Motor Lens has a full-time manual focus mode, allowing photographers to choose their preference between autofocus mode and manual focus mode. Fluorite elements in the lens reduce the chances of chromatic aberration and distortion, and Subwavelength Structure Coating reduces opportunities of flare and ghosting. Both of these features allow for less time spent post processing photographs. This lens is a must for professional and advanced photographers who wish to have a high-quality telephoto prime lens from Canon's L series.