Function: 1. 2. For a lens with the same refractive index, the 62 aspherical eyepiece is thinner and lighter than a spherical eyepiece and is mainly used do observations of planet. 3. The 62 wide-angle aspherical eyepiece allows for maximum detail and clarity across the entire field of view and achieves an image that is almost distortion-free. 4. This eyepiece provides high magnification, looks closer and more detailed, do moon watching and planet. 5. Thanks to the anti-loss design, the grooved part of the eyepiece interface can prevent loss, suitable do viewing scenery, bright celestial bodies, nebulae, etc. Specification: Item Type: Aspherical Eyepiece Material: Aluminum Alloy Type Aspherical eyepiece 4 mm 62 1,25 inch 10 mm Aspherical eyepiece 62 1,25 inch Aspherical eyepiece 23 mm 62 1,25 inch Focal length 4mm / 0,16 inch 10 mm / 0,39 inch 23 mm / 0,91 inch Vision 62 62 62 Mounting diameter Standard 1,25 inch / 31,75 mm Standard 1,25 inch / 31,75 mm Standard 1,25 inch / 31,75 mm Lens diameter 0,39 inch / 10 mm 0,39 inch / 10 mm 0,87 inch / 22 mm Coated optical lens, fully coated high resolution optical lens, fully coated high resolution optical lens, fully coated high resolution Construction of the optical system Aspherical eyepiece List of packages: 1 x Aspherical Eyepiece 2 x Lens Dust Cover