At 16mm, central sharpness is excellent at f/4, outstanding at f/5.6, excellent from f/8 to f/16 and very good at f/22. The edges are very good from f/4 right through to f/16, becoming soft at f/22.

At 10mm, central sharpness is outstanding at f/4 and f/5.6, excellent at f/8 and f/11, very good at f/16 and fair at f/22. The edges are excellent at f/4 and f/5.6, very good at f/8, good at f/11 ...