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The only difference between a 90mm and a 180mm macro lens of same quality is the working distance. If you are chasing things that are very nervous like dragonflies then the more working distance the better but
apart from that no difference except price. As for a portrait lens it is great for that too because it has a wonderful bokeh , that is the out of focus background looks very soft and smooth which is a good thing and being a f2.8 you can use that nice shallow dof for portraits .
Mark
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