Optolong LRGB Filters (4 pieces)Description Deep Sky Broadband CCD Filters: Luminance, Red, Green, and Blue The LRGB telescope filter Kit is designed for maximum contrast and with extremely high gradients for clear differentiation of colors of light. This set divides the spectrum into its components: red, green, blue and luminance. OIII emission overlaps on blue and green filters with maximum transmission to allow high efficiency and natural color imaging. Gap between green and red