Item Type: Telescope Filter_x000D_ Material: Optical Glass, Aluminum Alloy_x000D_ Applicable Aperture: 1.25 Inch Telescope Eyepiece 1[Premium Materials] This telescope filter is made of high quality optical glass and aluminum alloy, which is sturdy and durable. 2[Easy to Install] After installation, it can be used normally, the picture is clear without distortion, and it does not affect the observation picture. 3[Easy to Observe] Telescope moon filter can penetrate the vapor layer and ionosphere, and can observe deeper and farther in the polluted sky. 4[Reduce Stray Light] The 12.5inch telescope filter can reduce the influence of stray light when observing star clusters and look for unfamiliar novae. 5[Scope of Application] The telescope moon filter is mainly suitable for 1.25 inch telescope eyepieces, with strong practicability. 1 xTelescope Filter 1 x Storage Box