With a fast fixed maximum aperture of f/2.8, the Nikon AF- S NIKKOR 14–24mm f/2.8G ED lens' s exclusive lens technologies and innovations in optical design deliver outstanding sharpness, color and contrast, even in backlit conditions.The fast, ultra-wide-angle AF-S Zoom- NIKKOR 14–24mm f/2.8G ED is optimized for edge-to-edge sharpness on both FX- and DX-format Nikon D- SLR cameras.The AF-S Zoom NIKKOR 14–24mm f/2.8G ED' s rugged construction and professional-grade dust and moisture resistance withstand even the most trying conditions.Nikon's exclusive Silent Wave Motor (SWM) and Internal Focusing (IF) technologies enable ultra high-speed autofocusing with exceptional accuracy and powerful, super-quiet operation.