Thanks for all the insight on macro photography. I got the lens on Saturday and it's great. Only one gripe: in order to get 1:1 with the 55mm micro and the PK-13 extension tube, the front of the lens has to be a couple of inches from the subject. Not very good if you're using lighting due to shadows, etc. I think I should have gotten the 105mm micro instead. Oh well, I'll deal with it. I'll have some images for the Gallery soon.