I am confused about which lens to buy as well - I want to do macro as well as general photography. Had my heart set on the 100mm, but have read a review today stating that the 100mm is not a great one for macro, instead they would go for the 180mm. It is the only negative review I have read about the 100mm so am at a loss.
I don't understand this statement at all. Focal length is more a matter of what you will be shooting, an overly simple definition would be a 60mm macro would work well for jewelry, a 100mm macro would be a good all around focal length a 180mm macro would work well for extremely skitish creatures that won't let you get very close, remember I said overly simplistic, there is allot of room for crossover with all of those focal lengths I would say the 100mm focal length is the most popular focal length for macro shooting. I don't know who wrote the review but you either misread it or the author if full of crap.