Originally Posted by
neuroanatomist
The 7D has, "A new Intelligent Macro Tracking function helps reduce blur during macro shooting by recognizing when a macro lens is attached and automatically adjusting the AI Servo sampling frequency. This AI Servo adjustment accounts for camera movement forward and back, a typical occurrence when moving in close for a macro shot as photographers rock back and forth, or a flower blows in the wind." I assume that this mode will be implemented on the 1DsIV, but it's not available in the5DII or 1DsIII. I actually find that it works quite well in combination with the Hybrid IS on the new EF 100mm Macro.