Well, if you want AF macro tubes, you're better off buying a cheap dedicated lens. Depending on what camera you have, some options are: vivitar/pheonix/etc 100mm 3.5, this same lens is rebranded by a few different companies, can be had for $75-150. Try to find one with the 1:1 adaptor sigma/quantaray 50mm 2.8, can be had…