Astromania filters Set enhance subtle details on the planets, comets, and the Moon by selectively increasing the contrast between markings of different hues. This affordable 1.25-Inch Filter Set of Seven Telescope Filters include our most popular color planetary telescope eyepiece filters: #25 Red, #21 Orange, #12 Light Yellow, #58A Dark Green, #80A Blue and #56 Green. There is also a ND96 Moon Filter to reduce glare and increase clarity when observing the Moon. When stacking color filters, the effective transmission of the combination you create is equal to the product of the spectral transmission of each of the filters used. All eyepiece filters are threaded to fit Astromania, Celestron, Orion and most other manufacturers'1.25-Inch eyepieces. Most commonly used color plantary eyepiece filters to enhance views of planets and the Moon. Each filter features metal filter cell construction.