Feature: 1. 6mm Focal Length: This lens has 6mm focal length, 1.25in joint diameter, which is suitable for 1.25in astronomical telescope. 2. 66 Degree Wide Angle: This astronomical telescope wide angle eyepiece has a 66 degree field of view, 5 elements in 3 groups. 3. Optical Glass Lens: The lens adopts multi layer high definition broadband green film optical glass lens, chromaticity adjustment, which provides high permeability to ensure clear and has clear scenery. 4. Fully Coated Glass: The fully coated glass with excellent image contrast and light transmission with high brightness, large field of view that can keep your eyes in a comfortable state. 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: Astronomical Telescope Eyepiece Material: Aluminum alloy and optical glass Gross Weight: 125g/4.4oz Focal Length: 6mm/0.24in 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 Astronomical Telescope Eyepiece2 x Dustproof Cover