Red and NIR Color Filters
Red filters are long pass filters. IR pass filters are long pass filters, transmitting only IR light.
The cut-on wavelength is defined at 50 % transmittance of maximum. Color filters are absorptive filter that are used to increase contrast of a monochrome image, by isolating spectral regions and lighting colors.
IR filters are absorptive filters, too. They are used in front of a NIR sensor or an image sensor for NIR imaging where IR spectrum only is needed. The type of the filter is thereby depending on two main factors: color of the object and illumination.
Call for helping to select the best suitable filter.