I have just got myself a d200.When using my other camera D300 with the sb600 mounted on it and set up TTL.I get correctly exposed photos.When doing the same setup with the d200.Everything set the same,(exposure,speed, ISO,even using same lens) my pictures are underexposed.if I move the exposure compensation to approx +2.3 it come out the same as the D300.I have double checked all the menu settings etc and camera settings (both cameras the same)and cannot see anything obvious.Any help appreciated.