SVBONY 2 inch telescope moon filter is especially useful to owners of large aperture scopes;in which the Moon's brightness can be overwhelming. Maximum reduces glare for the observation of the moon and planets for a more comfortable and to increase the ability to catch faint details. Enhance lunar and planetary view. It can also be used for as a useful light pollution filter. Moon filter easier to observe. Good for eliminating the street light smog to deliver more clear and natural real image. It also will suppress sky glow from artificial lighting and background glow reflected when the moon is up. High quality metal frame with padded hard case. Fits for any standard 2 inch telescope eyepiece. The filters mainly improve contrast of lunar and planetary observation for take photos. Premium aluminum alloy frame and pure optical glass lens. Does a good job of cutting out light pollution. The sky is much more black than without it. However it does cause a halo. If you turn down the exposure it does go away or weakens up enough not to notice. Gain new enlightenment into the night sky by making your darks darker and your blacks blacker. This filter is a necessary component of any well stocked filter collection. With it, one can find both wonder and splendor in the darkness amid the paradox of the night and the logic of the light. Made of quality materials, lightweight, durable for years of use. SV128 Variable polarizing filter Suitable for 2 inch Telescope Eyepieces. Reducing the amount of light entering the eyepiece increases the contrast between the moon and the star, allowing you to see more details about the moon and the stars. SV128 2 inch variable Polarizing filter acts like a dimmer switch for your telescope. Adjust the amount of light transmission from 1% to 40% by rotating the filter housing. Reduces brightness of the Moon or planets for great clear viewing.