> This is the same for any lens, the 21/2 on the same magnification
> (could be a slightly different extension, internal focus and all) gives
> you about the same f-stops as the 20/2 macro.
So presumably this implies the only reason the macro lenses exist is
because they're physically smaller than the equivalent 'full-size' lenses,
so you can get the film plane close enough to the subject without hitting
it? I've tried using the 24/2 on extension tubes, and I found it wound up
with the in-focus point inside the lens.
-- dan
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