Mohamud wrote:
 
> > do you think using an extension tube on the SMC 100 f/4 Macro
> > to extend the ratio to 1:1 is a good idea? If so which do you
> > recommend?
 
        assuming the lens goes to 1/2 life-size  (1:2)  on its
        own, you would need an additional 50mm of tubes for 1:1

        1:1 requires total extension to equal focal length
        1:2 requires extension equal to 1/2 the focal length

        Bill

        ---------------------------------------------------------
        Bill D. Casselberry ; Photography on the Oregon Coast

                                http://www.orednet.org/~bcasselb
                                [EMAIL PROTECTED]
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