I have found the Auto ISO function on my D7000 to be very usefull. Set on M. Set F2.8 aperature (70-200mm F2.8 VR1) Set 1/400 shutter speed Auto ISO On 1/400 min 200 low 3200 high I am shooting hockey, through the glass. Arenas have crappy light. Getting great shots as the ISO adjusts up and down, not my Aperature or Shutter. 45Mps Sandisk Pro, 14 Bit Raw.