Gelatin has a very much lower refractive index than glass and its dispersion of different colours is practically nil. Unless the filter is damaged or dirty its effect on image quality should be unnoticeable.
Regards, Anthony Farr ----- Original Message ----- From: "Paul Stenquist" <[EMAIL PROTECTED]> > Thanks Mike. Another question: Obviously a VCCE head is convenient. Is it > superior to gel filters below the lens in terms of image quality? I've > considered the possibility of putting gel filters behind the diffusion > glass on my ancient Omega cold light head. It's accessible. Would this be > better than gels below the lens? I've been using gels below the lens ever > since I went to cold light, but it bugs me. I figure why worry about lens > resolution if you're going to put a cheap gel filter below it. > Paul > (previous message snipped) - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
