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SUPER-WIDE ANGLE ZOOM LENS: Perfect super-wide angle zoom lens for photographers who specialize in landscape, architecture, documentary, environmental portraits, and night sky image captures
CONSTANT f/2.8 APERTURE: With a constant f/2.8 aperture throughout the entire zoom range, the lens provides excellent sharpness and improved contrast suitable to today?? high-resolution cameras
AUTO-FOCUS SYSTEM: The lens uses an improved auto-focus system for fast and accurate AF and maintains the exclusive one-touch focus clutch mechanism for easy switching between AF to MF
CONSTRUCTION: The lens incorporates a complex optical design, with 15 elements in 13 groups. Using three aspherical lenses including a large aspherical P-MO element and 3 all-glass molded Low-Dispersion (SD) elements, the lens effectively suppresses chromatic and spherical aberrations
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