Excellent series. All nice and razor sharp. I especially like #7 with the two running directly at you both in fulll stride and the background nicely blurred. Why does the aperture change from f 2.8 to f 3.2 even to f5? The iso changes, too, even reaching iso 1000. Are you shooting in Program mode auto iso? I always shot sports in manual with the aperture as open as possible to keep iso down and shutter speed up. The shots turned out fine so just nitpicking.