The AF-S Nikkor 50mm F1.4 G is Nikon's latest take on the classic 'standard lens' concept, and was introduced in September 2008. It's a replacement for the older AF-Nikkor 50mm F1.4D which we reviewed last year, with revised optics to better meet the demands of modern high-resolution full frame sensors. The optical formula is an updated version of the classic 'double Gauss' design, with an additional element placed towards the rear to give an 8 element, 7 group configuration. According to Nikon, this improves correction of off-axis aberrations, which promises better performance towards the edges of the frame particularly when using large apertures.