I'd like to do some macro work with my GF1, and I'd like to see if I've missed something or if anyone has personal experience to help out. I strongly prefer 100mm and don't want zoom. Canon makes a SC FD macro, 100mm f/4. Goes for $100-150 used. Pentax makes a 100mm f/4 macro that's roughly $200. Oly makes one that was intended for a bellows or the telescoping extension tube (seems not worth consideration, I don't want to buy/lug around a bellows and the extension tube looks like a PITA to carry around) and Nikon made a nice 105mm f/2.8 that I can't seem to find used. Only other option I see is the Minolta 100mm f/3.5 for about $150. Any suggestions (esp if I missed something)? Thanks in advance!