At 25mm, central sharpness is excellent at f/1.7, outstanding from f/2 to f ... edges at 50mm, but it is unlikely to be noticed on most subjects. Chromatic aberration (CA) is the lens' inability ...

Central sharpness is excellent at f/2, outstanding from f/2.8 to f/5.6 ... Bokeh is relaxed and pleasing to the eye, and 50mm lenses, certainly fast ones, do benefit from the ability to throw ...