Longpass Filters are designed to transmit wavelengths greater than the cut-on wavelength of the filter. Longpass  Filters are used to isolate portions of the spectrum in a variety of industrial or life sciences applications including microscopy or fluorescence instrumentation. Longpass Filters can be used with Shortpass Edge Filters to create custom bandpass filters. Certain Longpass Filters can also be used as cold mirrors to minimize the heat buildup often caused by infrared radiation. Giai photonics offers a wide variety of Longpass Filters for performance in the ultraviolet, visible, or infrared wavelengths. Longpass Filters are available in a range of optical densities. Higher optical densities offer increased blocking capability.