I've been using my 100L for two years now. All macros tend to be very good. I had a older Sigma 105mm Macro and it was good. However, it also would not work with a Canon DSLR because of Sigma's reverse engineering. They charged me $100 to re-chip it. I've had three more that were that way, but could not be rechipped. I learned my lesson about Sigma the hard way..