The SVBONY 1.25" 66 degree ultra wide angle HD telescope accessory sets gives the wide viewing field along with extra sharpness and long eye relief. Red Filter; used in large telescopes, it sharpens boundaries and increases contrast on mars, sharpens belt contrast on jupiter, and brings out surface detail on ; blue filter; it provides detail in atmospheric clouds on mars, increases contrast on the moon, brings out detail in belts and polar features on saturn, enhances contrast on jupiter's bright areas and cloud boundaries, it also helps split the binary star antares when at maximum separation; green filter; it enhances frost patches, surface fogs, and polar projections on mars, the ring system on saturn, belts on jupiter and works as a general-purpose filter when viewing the moon.