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Re: optics/Japan (ii)



I believe the figure I quoted earlier was 1800 l/mm not 3000. Obviously,
the wave length of light and the resulting diffraction effects place a limit
on what a lens or a lens designer can do. The amazing thing is how close to
this limit good quality lenses actually come.

On Fri, 28 Nov 1997 10:38:30 -0600 brian whatcott said:

Hmmm...in return, I can tell you that any lens that claims a spatial
frequency transfer of 3000 lines per mm (the figure you mentioned 3 or 4
weeks ago)
is representing that it can transmit information on a spatial ( transverse)
wavelength of 333 nanometers, using visible light in the wavelength range
400 to 700 nanometers.

Quite a trick!

You have a reference, of course?

Sincerely

brian whatcott <inet@intellisys.net>
Altus OK