I've been very happy with the quality of my PL45, but as they say in Inception... We must go deeper! Anyone have any experience pairing a PL45 with extension tubes? Does it even work like that? I'm guessing the other option is to get a Canon adapter and pick up the MP-E 65mm, but I'm kind of liking having both kidneys right now and I'm not quite ready to part with one yet. Thanks!