At 11:54 AM 10/22/2002 +0000, you wrote: >> Is that the way filters work? I know they prevent the passage of >light but just exactly how do they do it? Is it a wavelength >interference voodoo or is it just tiny bits of opaque material in the >glass? > > 'Tis magic, I tell ya' > > Leaping electrons. Diversionary tactics. The wavelengths absorbed are determined by the molecules in the filter having an orbit/level that an electron can jump into when struck by a particular wavelength of light. This is how selected wavelengths are absorbed. Current chemical technology allows designers to exercise fairly precise control over what wavelengths will be absorbed. > >It is useful to remember that filters work by susbtraction, > by selectively keeping part of the spectrum and/or volume of incoming light from reaching the film. Color filters work by absorbing >their complimentary colors. Where these absorptions occur, they >leave blank areas in the negative, which reproduce as dark/black >on the print. Most filters do not totally block out their complimentary >colors, but simply attenuate them considerably. > > --- Luis > > There, see? I told ya.... little guys (molecules) dressed in primary colors waving at the light as it comes by... . Just like Luis sez, 'cept with all them big words.. AZ Build a Lookaround! The Lookaround Book. http://www.panoramacamera.us
