This series of lenses screws onto existing EF telephotos, converting them to closeup ("macro" lenses).
They appeal to me because I like to travel light, compared to lugging a 100mm macro with me. I seldom shoot macro, but when I do, I REALLY appreciate my existing EF-S 60 macro's performance. That lens is awesome, but does not fit full frame.
What would be the advantages of buying the 500D vs the 100 macro? And vice versa, why would one recommend the 100 macro over the 500D? Why not get a 85/1.8, that way you have a great lowlight lens and screw a $90 closeup lens on the front?
Do you lose infinity focus with the 500D?

(60 macro is 96 on crop)
