From the ManufacturerHelps reveal feature details of Jupiter easily in any telescope. 1.25" eyepiece filter with metal filter cell compatible with any filter-threaded 1.25" telescope eyepiece. Medium Blue 80A filter enhances contrast of Jovian features such as the Great Red Spot. Significantly increases visibility of the main equatorial cloud belts. Jupiter displays more surface detail than any other nighttime object except the Moon - make the most out of each view with this affordable filter