canon ef 1 4x iii extender accessories onestop digital
p the canon 1 4x ef extender iii is designed for canon l series telephoto lenses the extender is perfect for photojournalists nature and sports photographers who need to get close to distant and challenging subjects the 1 4x ef extender iii increases the focal length of a lens by a factor of 1 4x while still delivering superb image quality to ensure the best possible image quality in all shooting conditions it also combines enhanced environmental protection redesigned optics and improved data communication between lens and camera p p the extender allows professional photographers to shoot distant subjects without having to carry a number of heavy lenses the 1 4x ef extender iii features three groups of seven elements ensuring improved optical performance all optical elements use canon s super spectra coating reducing ghosting and flare to minimize post processing requirements a new fluorine coating on the front and rear elements makes marks such as spots left by water or fingerprints much easier to clean than standard coatings p