Franklin Polk , May 13, 2007; 12:20 a.m.
For a moving car and the flying plane, use mode 2. For birds flying, turn IS off. Mode 2 disables IS from working on the X axis (horizontal axis, so if you are panning (like tracking a car), you'll still get stabilization for up and down movement, but not any for side to side because you are panning anyways. Flying birds move pretty much every which way, which is why you'll want IS off for that.