Item Type: Astronomical Telescope Eyepiece Filter Material: Plastic Weight: Approx.64g/2.3oz Color: Yellow + Orange + Red + Green + Blue + Purple Applicable Interface: Approx. 31.7mm/1.25in Thread Specification: Approx. 28.6x0.6mm/1.1x0.1in Product Use: Weaken Light (Add Color) 1?��This set contains 6 different color filters, each with its own function to suit your different needs. 2?��Filters are threaded, compatible with any 25 inch telescope, and can be used alone or in stacks. Easy to install and use, they help filter out unnecessary light and make you look clearer. 3?��Red, strong contrast and enhanced blue green surface detail. Useful for Jupiter, Saturn. Increase the contrast with the bright blue sky when observing during the day or dusk. 4?��Light green, Martian ice cover and yellow dust storms also contrast with the increase in red and blue features on Jupiter and the Moon. Useful on the Moon, Jupiter, and Saturn to increase contrast without significantly reducing the brightness of the image. 5?��Orange is used to improve the contrast of light and dark when observing space, can penetrate clouds, observe Martian dust storms, and can be used to observe Jupiter's Great Red Spot. 6?��Light purple to reduce dazzle when observing the moon. Yellow color contrasts sharply with the blue features of Jupiter and Saturn, while enhancing the red and orange features. Can be used to increase the contrast of lunar characteristics.