The Nikon 85mm f/1.8G is a consumer-grade portrait lens for enthusiasts and seasonal pros that need quality optics of a fixed portrait lens at an affordable price point. Its large aperture of f/1.8 is great for low-light photography and the shallow depth of field helps isolate subjects from the background, beautifully rendering the background highlights, also known as bokeh. The Nikon 85mm f/1.8G replaces the older Nikon 85mm f/1.8D lens that had been in production since 1994. Compared to the AF-D version that has 6 optical elements in 6 groups, the new 85mm f/1.8G has a very different optical design with 9 optical elements in 9 groups. You would think with so much glass inside the new 85mm f/1.8G would weigh more than its predecessor, but in reality it actually weighs 30 grams less. The lens is designed to work on both DX (cropped-sensor) and FX (full-frame) cameras from Nikon. On DX sensors, the lens is equivalent to a 128mm lens, which is a good range for portraiture, but may be a little too long for most other types of photography.