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Message: <blockquote data-quote="Paganman2" data-source="post: 421357" data-attributes="member: 37668">I too can understand that, the d90 had an option to increase the size of the center focus box making it almost twice the size, but i assume it had a single x type sensor but only active at f5.6 or larger(i know the d7100 is f8)  i have tried dynamic 9 but i wonder if that again mite throw the focus off i have seen where it has chosen the trail over the plane and that has been in focus in stead,  such a shame it isnt just a bigger f8 x sensor with additional sensors normal line sensors or switchable(say you could switch x or line sensor on or off or mix?P.</blockquote>