The MAN-30-30 is a Neutral Density Filter, specifically an Absorptive Neutral Density Filter, designed for use in the visible light spectrum (400-700nm). This filter is manufactured by OptoSigma, a leading vendor in the optical industry, and is available for purchase through their website.
The filter is circular in shape with a diameter of 30mm and a thickness of 2mm, making it a thin lens. It is mounted on optical glass, enhancing its durability and functionality. The front and back of the filter are coated with "opt and-30", a coating type that is not specified in the item data. However, it can be inferred that this coating enhances the filter's performance and longevity.
The filter's material ID is UVFS MAL-1965, suggesting that it is designed to filter specific wavelengths within the ultraviolet and visible light spectrums. The wavelength of 550nm indicates that this filter is most effective at filtering green light.