I have recently been debating on what to do as far as a lens for macro photography. A macro lens is about all I am missing as far as a lens for different types of photography. What i am currently debating is using the 24-70L that i already have paired with some kenko extension tubes, or going one of the 100mm macro lenses. Also on my list of lenses is the 65mm 2.8 1-5x macro lens. I'm not sure what the benefits of any of these are over my current 24-70 with the kenko tubes. Any help would be appreciated.