Good in the center bad in the border at f4 or less
Resolution: Very, very good in the center (1/3) , but very bad iin rest 2/3 ( f 4 or less); Excellent at f 5,6 or more, very sharp (print at 40 cm x 60 cm). Color and contrast, superb. In 16 mm high distorsion. Hermetic, no problem with water or dust. Perfect to nature and mountain.