Colour Filters for Astronomy

This page last modified 2002 October 31
Red Orange Yellow Green Blue Violet
Sun Use with mylar solar filter to restore colour
Moon Greatly enhances features
Mercury Reduces sky brightness during daylight and twilight observations Reduces sky brightness during daylight and twilight observations Reveals some surface markings at twilight Enhances faint features
Venus Use during daylight to reduce sky brightness Use during daylight to reduce sky brightness Reveals some surface features Reveals cloud patterns Reveals some cloud detail Improves cloud contrast
Mars Enhances polar caps Darkens maria and canali Darkens maria and canali Increases contrast of polar caps and dust storms Improves polar caps and some surface features Improves polar caps
Jupiter Enhances detail in belts and festoons General enhancement of surface detail Improves contrast of Great Red Spot General enhancement of red belts and Great Red Spot
Saturn Enhances bands General enhancement and clarifies Cassini's division Enhances low-contrast features Enhances detail in the rings
Uranus Shows some detail in large telescopes (>250mm)
Neptune Shows some detail in large telescopes (>250mm)
Comets Enhances dust tails Can reveal some structure in brighter comets Increases detail in gas tails Can reveal some detail in bright comets
Comments Do not use on small telescopes (<150mm)