Contact Rainbow Research Optics for Optical Filters for your next project. Here are just a few of the optical filters that Rainbow Research Optics offers are: Interference Bandpass Filters, Reflective Neutral Density Filters, Absorptive Neutral Density Filters, Long Wave Pass Filters and Short Wave Pass Filters. Online you will find additional informational graphs about their optical filters. Visit Rainbow Research Optics where our fast turnaround, helpful staff and low prices make this company stand out. difference. See what Rainbow Research Optics can do for your next project today!