Nikon 85mm f1.8

While not an exceptionally cheap lens, it’s still very affordable for the performance it provides. It’s sharp and has the best focus performance of all my lenses, which is important if you plan on using it wide open and don’t really trust your eyes enough for manual focus. Loved it since the moment I got it and if you’re looking for a dedicated portrait lens, this would be it. Sometimes it feels a tad long when used on a DX camera, so I expect it will be an even better fit on a full frame body.