--- Ken Durling <[EMAIL PROTECTED]> wrote:
> It seems like many manufacturers, Canon, Tamron,
> Sigma, even Vivitar,
> make prime 100mm-range macro lenses that everybody
> raves about as
> being ultra-sharp. Is there something inherent in
> the design
> parameters of one of these lenses that allows this
> ultimate sharpness?
I don't think it's sharpness, but rather working
distance. To get a 1:1 ration with a 50mm lens,
you're lens is extremely close to the subject. A
100mm roughtly doubles the working distance. Longer
focal lengths, OTOH, probably begin to add a great
deal of cost.
=====
Bob Meyer
I wish I knew what I know now, when I was younger...
http://www.meyerweb.net/epson
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