The Nikon AF-S Nikkor 50mm f/1.4G is a small and compact, high-quality standard prime lens for Nikon's FX (full frame) and DX (APS-C) DSLRs. A standard prime is one of the best purchases you can make for a DSLR system - the classic 50mm focal length is amazingly versatile, and typically offers extremely good optical quality for a relatively low cost. The Nikon 50mm F1.4 G is no exception. A lightweight, tack-sharp standard lens on full-frame DSLRs, it offers an effective focal length of 75mm on Nikon's DX format, making it very useful for portraiture and low-light candid photograph. Compared to the older AF-D version, this new lens is optically superior, and offers silent (although slower) autofocus.