i would like to find out if the above lens can be used for macro function as well? i seem to have read somewhere that it's predecessor (80-200 2.8) can be used for macro, but i'm not too sure how it compares. if i'm on a budget, and would like to have telephoto and macro function as well, would you advise that i get the 70-200 VR, or the 105 2.8 macro?