> 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?
Macro lenses are designed for high magnifications (typically
1:1), while general-use lenses aren't. One can often
achieve a high magnification using an extension tube or
closeup lens on a standard lens, but the resulting image
won't be as tack-sharp as with a real macro lens.
Macro lenses e.g. the Macro 100/2.8 USM are too much fun :-)
http://www.larsmichael.com/cgi-bin/gallery?series=garden_flowers
Lars
--
Lars Michael [EMAIL PROTECTED]
87GT http://www.larsmichael.com/
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