Optical filters are used to selectively transmit or reject a wavelength or range of wavelengths. Filters are often used in machine vision inspection. We offers a variety of filters for many applications, including bandpass interference, notch, edge, dichroic, color substrate, or ND. When selecting an filter for your application, the most common behaviour of the filter is to enhance the color or bandwidth but also blocking feature are possible. Polarizing filters are commonly used with illumination to eliminate reflections.