It seems to just be marketing wrapped in some fluff. D50 -E.

Is it okay to buy a 50 mm prime with f1. With a Nikon camera, except the series, series and a few others like the D will work with the Nikon 50mm f1. The times when you might want to consider a DX lens over an FX lens for a DX format camera are when you consider wide angle options.

I was told the 1. Learn to appreciate the primary differences, and it will become much easier.