Ultra-wide picture angle of 180 degrees on DX sensor is achieved by producing a smaller image circle (the size of the image that is projected by the lens onto the sensor) enabling a smaller lens diameter, lighter weight and optimal image quality from center-to-edge-to-corner on the image.
Minimum focus distance of 0.14m (5.5 in.) or 0.03m (1.2 in.) from the lens front, makes extreme close-ups possible.
Extra-low Dispersion (ED) glass element minimizes chromatic aberration.
Nikon D-type design provides precise distance information for flash and ambient light exposure processes.