Feature: 1. 66 Degree Wide Angle: 20mm focal length, and the wide angle eyepiece has a 66 degree field of view, gives you the widest viewing and bring the distant scene in front of you. 2. Optical Glass Lens: 5 optical glass lenses in 3 groups. With excellent image contrast and light transmission; high brightness, large field of view; keep your eyes in a comfortable state. 3. FMC Green Film Coating: Multi layer high definition broadband green film optical glass lens, chromaticity correction; provides high permeability to ensure clarity; clear scenery. 4. Standard 1.25inch Interface: Suitable for any 1.25inch31.7mm aperture telescope eyepiece interface. In a threaded design, which is easy to connect to other adapters. 5. Applicable Scene: The lens is suitable for viewing scenery, bright celestial observation, nebula, etc., and it is also Halloween birthday Christmas gift for family and friends. Specification: Item Type: Telescope Eyepiece Material: Aluminum alloy, optical glass Gross Weight: 125g 4.4oz Focal Length: 20mm 0.8in Field of View: 66 degrees Lens Coating: FMC green film Number of Lenses: 5 elements in 3 groups Connector Size: 1.25 inches (31.7mm) Anti Slip Design: Yes Thread Specification: M28.6x0.6mm. Package List: 1 x Telescope Eyepiece2 x Dust Cover
