hi i am looking or a nikon mount zoom lens of range up to 300mm with a fast auto focus. As I am into wildlife photography, I need a lens with a considerable zoom and a fast focus to capture the motion of animals. Currently i have a nikkor 70-300mm G lens, but the focus is not fast enough to shoot animals in motion like flying or running. Of cos i could not afford the very expensive ones as I am only a NS man. Would appreciate any advice from u guys thx