If the image is magnified then a fixed amount of light is being spread
over a larger area which equals a dimmer image. No free lunch except on
Tuesdays with your frequent diner card punched to show your prior 10 visits.
Dr. Flash
usher99@xxxxxxx wrote:
> makes me thing that macro lenses that achieve magnification by
> shifting internal elements and not just extension may have a slight
> advantage from a diffraction vantage point as the optical path is
> shorter. Whether this hypothesis violates the "no free lunch"
> principle, I am not sure. Perhaps Dr. Focus would have an opinion as
> well.
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