Rainbow Research Optics offers several optical filters and coatings. Research Optics has been leading the way with the best optical filters around. You will find high quality standards and fast delivery on all Rainbow Research Optics products. Whether you are looking for Absorptive Neutral Density Filters or Color Glass Bandpass Filters, all of our products will come to you with our outstanding customer service, fast and accurate work and then delivery to you quickly. For more information visit www.rainbowoptics.com today!