1、Wide Applications: Dual use of heaven and earth, suitable for all astronomical telescopes (1.25 inch interface), used for astronomical observation of celestial bodies such as the lunar surface, planets, nebulae, star clusters, diffuse nebulae, etc. 2、Size and Storage Box: Standard 1.25 inch astronomical telescope universal eyepiece. Comes with a sturdy plastic storage box to protect the eyepiece from dust and moisture. 3、Wide Vision: The 20mm astronomical telescope eyepiece has a wide field of view and superior performance. Foldable eye cover allows for easy viewing even with glasses. 4、Good Features: Bottom extinction thread rotatable 1.25 inch filter, can be used with standard 1.25 inch interface telescopes or filters. High brightness, large field of view, and very comfortable observation. 5、Multi Layer Coating: 1.25 Inch 20mm eyepiece adopts full multi layer broadband coating, premium optical glass, providing maximum brightness and high clarity. 6、All Metal Body: 1.25 inch 20mm astronomical telescope eyepiece has all metal body and multi layer coating on the entire surface, with good optical performance. Item Type: 1.25 Inch 20mm Eyepiece Material: Aluminum Alloy, Optical Glass Weight: Approx. 76g / 2.7oz Focal Length: Approx. 20mm / 0.8in 1 x Eyepiece 1 x Storage Box