I started fooling around with my new MP-E 65mm f/2.8 1-5X lens today – it is a tricky one!  I am not really set up yet to properly use it, and it will have a large learning curve, but here are a couple of early attempts of shooting single blooms of H. heuschkeliana with it at around 3x.

Also, check out my Best Photos section for a particularly nice shot.  Once I am set up properly, I think this lens will be capable of some outstanding images.