Been mucking around with my new macro stuff I got off ebay/amazon over the last month or so, took some time to get used to with lack of auto-focus but worked out well in the end.
Right now Im using my 5D MkII, f1.4 50mm and 2/3 extension tubes. I have a reversal ring to but I didnt use it for these. I have to lock the aperture open before I put int he extension tubes because there manual. I shoot first in AV mode then if needs be (if to bright or to dark) I switch to manual and adjust the shutter speed to shoot. Its tough but Ive gotten much better at focusing manually thanks to it.