This is a VERY sharp lens corner to corner wide open and gets phenomenally sharp stopped down a few stops. It's a lot bigger than the old F mount 50mm Nikon made lenses, but it's nice and light for the size. It's a bit smaller than the F mount Sigma Art 50mm (which is an excellent lens) and is a lot lighter while just as sharp, if not sharper. A great Nifty Fifty.