dumb question - filters

[Joseph O'Neil]

Hi all;
Is there a web site anywhere that lists or shows spectral transmissions for photographic filters?

Give you an example of the sort of thing I am looking for, wee this web site
http://www.astrosurf.com/~buil/filters/curves.htm

Reason I am asking is not all red or yellow or magenta filters are the same. Tried the various company web sites (Hoya, Tiffen, B+W, etc) but failed to find anything. Maybe I just didn't look right.

thanks much
joe

[Ralph Barker]

Does this have what you're looking for?

http://www.schneideroptics.com/pdfs/...sionCurves.pdf

[Ron Marshall]

This is also good:

http://photo.net/learn/optics/edscott/cf000010

[Joseph O'Neil]

IN a word, the above two links are simply perfect. Many thanks gentlemen!

[Bob Salomon]

Try the Heliopan site. It is in German but all filters are shown. The same curves are in the Heliopan brochure which is in English.