Quote:Trying to understand the rating. If the borders would not be soft how many stars would the 16-70 receive.
Well, that depends on the borders :-) A sharp center is no real achievement.
If the borders/corners were as good as the center, it would be a 5* rating - in this case the other characteristics would be considered to be minor aspects but then no zoom lens on mother earth could do that.
As is the performance at 70mm is the dominant factor for the rating.