You can count on excellent customer service from optics specialist Rainbow Research Optics. We offer free quotes, access to informational graph online as well as a factory tour, all right online for your convince. We also offer windows, lens, Mirror Substrates, Beamsplitters,Laser Mirrors, Coatings, Wave Plates, Polarizers, Prizims and Optical Filters. Visit www.rainbowoptics.com to to view their many capabilities.