Telescope Filter - Red, Orange, Yellow, Green, Blue, Purple. Ultra High Contrast Filter, can effectively filters out selective wavelengths of low-pressure sodium and other man-made sources typically used in street lighting. Cuts down glare and brings out much more surface detail and gives you better contrast. Standard 1.25 inch Thread - The telescope filters are threaded and compatible with any 1.25 inch telescope and can be used individually or in stacks. Color filters have the grooves needed to be softly screwed into the eyepieces lens easily. Enhances Contrast - It is a multi-band pass filter transmitting a high percentage of light in the visual spectrum. When observing brighter objects, emphasize features, and sharpen the contrast of Mercury, Mars, Venus, Jupiter, Saturn, Moon, and other celestial objects. High Quality Material - Made of acrylic lens and aluminum frame, lightweight and durable. Easy to carry and use. Help filter out unnecessary light and make you look clearer, great for city and suburban observation. Best Gift - Use for planetary observation, deep-sky imaging, or terrestrial photography with enhanced clarity. Perfect for beginners and experts. A thoughtful gift for amateur astronomers and astrophotographers.