Rainbow Research Optics offered standard and custom coatings, as well as Optical Filters. Some of the optical filters that Rainbow Research Optics offers are: Reflective Neutral Density Filters, Absorptive Neutral Density Filters, Long and Short Wave Pass Filters and more. You can easily find more information with the help of their informative optical filter graphs. Contact Rainbow Research Optics for all your optics needs and receive a free quote! Visit online at www.rainbowoptics.com.