That begins to make sense. I will have to run sum numbers and see if I can not
get my head around it.
Bob Blakely wrote:
The energy dispersion math relates to angle. f/(N/2) is the cotangent of an
angle.
--
graywolf
http://graywolfphoto.com
You might as well accept people as they are,
you are
This seems like a good place to ask a question of you mathematically inclined
folks out there.
In the well known internet lens tutorial
http://www.photo.net/learn/optics/lensTutorial
In the part about diffraction he uses N to derive his answer. To me it seems
that it should be D. However,
N (from f/N) is correct. The diffraction effect (having already stipulated
visible light) in a camera or telescope is (essentially) completely defined
by the stop if the measure of acceptance is related to a fixed distance on
the film. (0.03mm or x lines per mm - whatever).
Regards,
Bob...
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