I love this lens 16-35 for general daylight shooting ,but for the night i was very disappoint with the performance wide open really soft ,and the worst thing i haven't test it ,till i was in Norway .I should use my Samyang 14mm for the Auora photos it was much more sharper wide open at the infinity .Worst thing i had it in my camera bag ,but i was sure i didn't need it .Lesson not all lenses are for Auora photos wide open tack sharp .