An important unmentioned feature of Canon's new 100mm IS lens is that the filter diameter is 67mm instead of 58mm (the filter diameter of the classic).


What this means to all you macro photographers looking for an upgrade is that you're in for a frustrating surprise the first time you try to pop on your trusty MT-24EX twin flash. It won't fit without the Macrolite Adapter 67! As others have noted, IS is not a substitute for a good flash when it comes to serious macro work. Canon's website and all of the reviews I've seen could stand to make this explicit.