The optical design of the lens is something to behold. It features 10 elements in 7 groups, with a single aspherical element that abolish coma and other types of aberration, even when shooting wide open. A 9 blade aperture smoothes out the focus of background of an image, delivering bokeh that is very pleasing to the eye and unraveling your subject from the background. The lens can be used on Nikon FX and DX DSLRs. It is a "G" series, which means that there is no physical aperture ring; the aperture must be controlled by the camera. When used on a DX camera, the lens provides the equivalent field of view of a 52.5mm lens in the 35mm format.
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