Rainbow Research Optics has over 15 years experience, you can count on. They offer many Optical Filters. They also offer custom optics, windows, lens, Mirror Substrates, Beamsplitters,Laser Mirrors, Coatings, Wave Plates, Polarizers, Prizims and more! Rainbow Optics offers high quality standards and delivers products with fast turnaround times. Visit today at www.rainbowoptics.com for more information or questions.