How much magnification would you want on your macro, and at what focal length would you want the macro? The Minolta 70-210 f4 (Beercan) is a must get for its price and performance for all people with a Sony body, it is a *bit* of a macro lens, with a 1:4 Magnification at the 210mm range (315mm field of view 35mm equivalent).

If you need something with more magnification, minolta has in its system Macros that go as close as 3:1, and at ranges between 50mm and 300mm.