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EF500mm f/4.5L USM High picture quality from maximum aperture is realized by an optical system incorporating artificial crystal fluorite and UD (Ultra-low Dispersion) glass lens elements(2nd & 4th), which eliminate chromatic aberrations. High-speed and silent AF with full-time manual focusing, focus-preset mechanism and power manual focusing sensitivity control, are ensured by a ring USM(Ultrasonic Motor) and inner focusing system. Extenders EF 1.4X and EF2X are compatible with this lens with manual focusing.
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