I don't want to spend the money on a true macro lens (600, right?), but reverse macro is very limiting, being that I can only be a certain distance from the subject...and DOF is uncontrollable. Is there something $200 or under that will help with extreme closeup capabilities? Here's what I've seen: -Extension tubes, 10 bucks a set on ebay -Canon EF12 - $60ish. Any other ideas? Has anyone tried these?