Central sharpness is very good at f/1.4, excellent from f/2 to f/8 and very good at f/11 and f/16. The edges are also very good at f/1.4, excellent from f/2 to f/8 and very good at f/11 and f/16 ...

where it becomes the equivalent to a 90mm.It features a complex optical construction with 9 elements in 6 groups with, unusually, two aspherical elements and nano-crystal coating. As with the upgrade ...