Design enables a combination of wider angle-of-view with optical characteristics that are optimized for Nikon digital SLR camera sensors. 2x Zoom ratio and variable angle-of-view from 99 degrees at 12mm to 61 degrees at 24mm. Comparable to that of an 18-36mm lens on 35mm size sensor format. Nikon design that produces a smaller image circle (the size of the image that is projected by the lens on to the sensor) enabling smaller lens diameter, and optimal image quality from center-to-edge-to-corner on the image. Exclusive Silent Wave Motor enables ultra-high-speed autofocusing with exceptional accuracy and powerful super-quiet operation. 2 Extra-Low Dispersion (ED) glass elements for minimized chromatic aberration. 3 Aspherical lens element for low distortion. Internal Focusing (IF) design for smoother focusing and great body balance. M/A mode enables instant switching from autofocus to manual with virtually no time lag even during AF servo operation. Nikon D-type design provides precise distance information for flash and ambient light exposure processes. Rounded diaphragm to make out-of-focus elements appear more natural. DX Nikkor is designed exclusively for use with Nikon Digital SLR models. 11.8 close focusing distance throughout zoom range.