one Fluorite and two UD (ultra low-dispersion) elements.
The EF 70-200mm f/4L IS USM is a lightweight, compact L Series telephoto zoom lens with Image Stabilization, proving up to 4 stops of correction. Optical construction includes one Fluorite and two UD (ultra low-dispersion) elements. Designed for use on Canon’s APS-C and full-frame DSLRs, this weather-sealed lens is solidly built and capable of great results.
The Canon EF 70-200mm f/2.8L IS II USM Telephoto Zoom Lens increases the speed, performance and optical quality of the EF 70-200 f/2.8L IS USM while maintaining all of the characteristics that have made it a legend for professionals and advanced amateurs alike. This lens features one fluorite and five UD elements for increased optical quality and reduced chromatic aberration. It has a minimum focusing distance of 1.2m/3.9 ft. at all zoom settings, which is useful for photographers in smaller spaces trying to get closer to a subject. A next-generation Optical Image Stabilizer, provides up to 4 stops of correction at all focal lengths. Plus the EF 70-200mm f/2.8L IS II USM is dust- and moisture-resistant and designed for use in the challenging environments typical of rigorous professional use.
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