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Fast, ultra wide-angle AF-S zoom lens optimized for edge-to-edge sharpness on both the Nikon FX- (23.9 x 36mm) and DX-format image sensors. 
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Enhanced optical formulas engineered to produce exceptional sharpness, contrast and color, rendering outstanding image integrity. 
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Two Extra-low Dispersion (ED) elements and PGM aspherical lenses control chromatic aberrations while enhancing sharpness and contrast even at the widest aperture settings. 
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Exclusive Nano Crystal Coat further reduces ghosting and flare for even greater image clarity. 
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Nikon's Silent Wave Motor (SWM) enables ultra-high-speed autofocusing with exceptional accuracy and powerful, super-quiet operation. 
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Internal Focus (IF) provides fast and quiet autofocusing without changing the length of the lens, retaining subject-working distance through the focus range. 
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Focus as close as 10.8 inches at the 24mm setting. 
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Rugged construction with professional-grade dust and moisture resistance. 
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M/A focus mode switch enables quick response to changing situations between auto and manual focus operation.