Features 1、Made of high‑quality aluminum alloy, it can ensure that the filter is durable and not easily scratched and deformed. 2、High‑accuracy CNC process production, it can ensure that the filter size and color uniformity are in line with high standards. 3、High‑transmittance filter, no impurities, high light transmission ability, will not affect the observation. 4、Lightweight and compact, you can easily place or use it without taking up extra space. 5、It can be used in astronomical telescopes, which can help reduce light pollution, so as to make safer and more accurate observations. Specification Item Type: Telescope Filter Material: Aluminum Alloy Uses: It can be used for astronomical telescopes. Filter Size: Approx.50.8mm/2in Package List 1 x Telescope Filter 1 x Storage Box