On Sat, 21 Mar 1998, PCA Cala wrote:
|Hi Windsor:
|
|<< If macro correction is a large issue in a lens to be used for
|macrophotography, why isn't it an issue when using a lens with macro
|correction at "normal" shooting distances? >>
|
|A lot has to do with the magnification ratio. First off, many general purpose
|macros without floating elements are optimized for about 1:10 They fall-off
|from prime performance towards infinity and towards 1:2 Olympus found a way
|to boost performance above and below 1:10 by using floating elements AND
|managed to give us an f/2.0 aperture in the process!
Both Zuiko 50mm macros and the 90/2 macro have design
optimums of 1:10 lifesize. Obviously, they still provide
great performance from infinity to 1:2 lifesize.
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