It's the Nikon 50mm f/1.8 prime lens ... It's a great lens for portraits, or what I refer to as "people shots." On the river, this translated to photos of anglers showing off their catch, hook ...
Central sharpness is very good at f/1.8 and f/2, excellent from f/2.8 through to f/5.6, very good from f/8 to f/16 and fair at f/22. The edges are good at f/1.8 and f/2, very good from f/2.8 to f ...