Use for Monochromatic Imaging, Red, Green, Blue Primary Color Filters, UV/IR Cut / Luminance Filter, No Halos, Reflections, or Ghosting, Precision Planeoptically Polished, 95% Transmittance, All Filters Are Parfocal, 2" Eyepiece Filter Threads, Not for Solar Viewing or Imaging. Use the Alpine Astronomical Baader L-RGB CCD Imaging Filter Set during monochromatic imaging for creating stunning custom composite images of nebulae planets and other celestial objects.By capturing a single subject in each of the three primary colors—red green and blue—and stacking them in post production using specialized software you can create any colors you want or highlight your subject's natural properties. The fourth filter a luminance filter is used to block ultraviolet (UV) and infrared (IR) light to allow only the visual spectrum between to pass through. Since many of today's imaging sensors are sensitive to IR and UV wavelengths you can stack the luminance with any of the other three colored filters to eliminate ghosting caused by bands outside the visible spectrum bleeding into your image—especially with the blue and red.Each filter is planeoptically polished and anti-reflection multi-coated to ensure high and uniform light transmission across the entire surface to maximize brightness and limit distortion halos and reflections. With a greater than 95% transmittance and all filters being parfocal exposure times remain unchanged when you switch colors or if you don't use them at all. These filters are offered here mounted in a standard 2 eyepiece filter holder for eyepiece imaging techniques such as afocal and projection imaging.