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In article <NEBBKHCFDGIGIJEHDJFCCENADEAA.firstname.lastname@example.org>, Paul D. DeRocco <email@example.com> writes >Kewl. How do you do an optical Fourier transform? > Probably a lot easier that you thought, Paul - you do it all the time! :-) An ideal lens is a real time Fourier Transforming device. The image formed by the lens is just an FT, scaled by wavelength, of the light intensity across the lens stop. That is why, in a perfect lens, the image formed by a monochromatic point source is the well known Fresnel diffraction pattern - the FT of the circularly symmetrical lens aperture. Many textbooks have been written on this topic, but a couple worth looking at if you want to know more are: JW Goodman : Introduction to Fourier Optics published by McGraw Hill and JD Gaskill : Linear Systems, Fourier Transforms and Optics, published by John Wiley. -- Kennedy Yes, Socrates himself is particularly missed; A lovely little thinker, but a bugger when he's pissed. Python Philosophers - Turn off HTML mail features. Keep quoted material short. Use accurate subject lines. http://www.leben.com/lists for list instructions.