i am trying to decide on a macro lense for my olympus e510. could anyone recomend a good one for me and give me reasons why you are recomending what you recomend? are the zuiko lenses considered the best for olympus cameras? i have done a little research into some of the sigma & panasonmnic lenses but have not gotten any real feel for them. i was looking at the sigma 30mm 1.4 but it got as many bad reviews as it got good ones. i did notice that a lot of the bad reviews came from cannon or nikon users. have any olympus users had experiences with sigma lenses they would care to share with me?