> To play around with macro before 
        > considering a significant investment 
        > in it, would I be better off trying 
        > a reversing ring on the 24-50 at 50mm, 
        > or a close-up filter on the 70-300 

        I'd go with the close-up lens on the 70-300.
        You'll get more camera-to-subject distance with 
        that.


        -Don

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