If you want to go over 1:1 magnification, the little known secret is this... use 2 lenses... If you have 2 L lenses or super sharp lenses, even better... Get a double thread filter adapter ($7-8 online) that has the filter size thread of both your lenses or close to them and use a step up/down rings to make them fit and basically mount the shorter of the two lenses to the camera and and the butt of the second lens will be sticking out. You will have a razor sharp and razor thin DOF. The bigger the ratio from the big lens to the small lens, the more 2x-4x-6x magnification you will get. Seriously, it's a little awkward however using this you can photo bed bugs and such by moving these lenses over your bed... You will never be able to sleep on your bed again haha. Use the mounted lens for focus. This was a technique taught to me by renowned photographer Ralph Clevenger from BIP. The best thing is it doesn't cost you ANYTHING more than 2 of your everyday lenses and a cheap adapter. Good luck.