Years ago I had a book from Kodak that provided charts of spectrums for lots of different filter types. It would show me the wavelength cutoff of filters such as type 12 and 15 for example. It had charts for many dozens of them. Over the years, and moving through 3 states, that book has disappeared. I've been looking online for similar data, but have so far been unable to find anything (not even at Kodak's site). Has anyone seen anything like that around?