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* 1.25" 45 degree prism mirror for astronomical telescope eyepiece. * You can insert it into the 1.25 "telescope silver terminal, the other end with a screw fixed 1.25" eyepiece. * Standard 1.25 "diameter: for 1.25" eyepiece and telescope * Optical lens transparency is high, Provide clear and sharp images * Suitable for all astronomical telescopes (1.25"), used to observe astronomy, nebula, cluster, nebula scattered, high brightness, wide field of view astronomical observation, very comfortable; semi-metal, surface coating, optical properties excellent.