Boxed. The world’s first lens with a smaller image circle, optimised for the DX sensor format of Nikon DSLRs. 12-24mm ultra-wide angle G type zoom lens equivalent to 18-36mm in 135 format. ED (Extra low Dispersion) glass elements minimise chromatic aberration to provide higher resolution and superior contrast. Nikon’s exclusive SWM (Silent Wave Motor) for swift auto focusing with superior accuracy and ultra-quiet operation. Three a spherical lens elements minimise distortion, especially at the periphery, for superior optical performance.