Professional 1.25 Inch Telescope Eyepiece 21mm Lens For Astronomy Enthusiasts

Feature: \n 1. Thread Specifications: Telescope eyepiece is available in threaded format and can be purchased additionally for use with astronomical telescope filters if required.\n2. Superior Performance: Telescope lens is a 3 group, 5 piece optical structure with a focal length of 21mm/0.83in and a large field of view of 52 degree for comfortable viewing and easy target finding.\n3. Optical Glass: Telescope lens is made of high quality optical glass with FMC coating for low chromatic aberration, high light transmission, low dispersion and clear images.\n4. Metal Material: The barrel of the telescope eyepiece is made of aluminium alloy, which is strong and durable, and the internal matte finish reduces reflections.\n5. Foldable Design: The astronomical telescope eyepiece is designed with folding eyecups to prevent fatigue during long viewing sessions. Convenient to use. \n\nSpecification: \n\nItem Type: Telescope Eyepiece\nMaterial: Aluminium Alloy, Optical Glass\nInterfac: