It is also worth mentioning that the 70-200 has two IS modes. The 2nd allows for side to side panning with the IS correcting for only the vertical camera shake. This can help with shots where the subject motion is side to side.


At the 70mm end of the zoom the IS is almost never useful for moving subjects, in my opinion. By the time IS is getting useful (under 1/100s) you are already getting subject motion blur. Being able to shoot at 1/30s or 1/15s won't help if the subject is moving. I would take a f/2.8 non-IS over a f/4 IS for shooting sports...