Rudy
Because the back element (or probably more correctly the exit pupil, or
the rear nodal point) of the macro lens is comparatively far away from
the film plane, the light rays can pretty much be considered to be
parallel -- at least compared with, say, the 21mm lens focussed at infinity.
This is why reversing "normal" lenses helps them perform better for macro.
Vaughan
--
Ruediger Betzold wrote
> I ask this, because in a German 6 page information from Olympus
> for their Marcophoto System they show a Hasselblad mounted to a Olympus
> bellow with an adapter and Zuiko Macro lens. The Hasselblad has a digital
> back
> mounted to it.
snip
>
> It is obvious that the macro lenses are special computed for
> macro shoots, but are they so different that this allows them to be used
> with a digital back ?
>
> Rudy
> Berlin/Germany
>
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