Telescope Eyepiece 1.25 Inch 21mm 52 Degree Wide Angles Professional Telescope Lens for Telescope

Feature: 1. Thread Specifications: Telescope eyepiece is available in threaded format and can be purchased additionally for use with astronomical telescope filters if required. 2. Superior Performance: Telescope lens is a 3 group, 5 piece optical structure with a focal length of 21mm0.83in and a large field of view of 52 degree for comfortable viewing and easy target finding. 3. 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. 4. 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. 5. Foldable Design: The astronomical telescope eyepiece is designed with folding eyecups to prevent fatigue during long viewing sessions. Convenient to use. Specification: Item Type: Telescope Eyepiece Material: Aluminium Alloy, Optical Glass Interface Size: 1.25 inch Focal Length: 21mm0.83in Field of View: 52 Degree Pupil Distance: 13mm0.51in Lens Coating: FMC Optical Structure: 3 Groups of 5 Lenses Thread Size: M28.5x0.6mm0.02in. Package List: 1 x Telescope Eyepiece2 x Dustproof Cover