- This eyepiece is a neutral product, attention! - This eyepiece is a neutral product, attention! - This eyepiece is a neutral product, attention! - The eyecup can be folded, suitable for users with or without glasses. This product is finely crafted with excellent coating, featuring a 66° ultra-wide field of view and long eye relief. It is suitable for landscape viewing and astronomical observation, especially for large-area deep-sky celestial bodies, providing high light transmittance and image quality. - 20mm --- 5 pieces of glass - 66° UW Wide-Angle Eyepiece Series - 4 eyepieces in the same series: 6mm / 9mm / 15mm / 20mm - *1.25 inches / 31.7mm interface *Multi-layer coating *Astronomical telescope stargazing accessory - 【Model】: UW6MM, 9MM, 15MM, 20MM Astronomical Telescope Eyepieces - 【Focal Length】: 6, 9, 15, and 20MM respectively, high-power eyepieces - 【Field of View Angle】: 66 degrees (generally, an eyepiece with a field of view angle greater than 48 degrees is called a wide-angle eyepiece) - 【Size】: Standard 1.25 inches / 31.7MM universal accessory for astronomical telescopes - 【Application】: Applicable to astronomical telescopes (1.25-inch 31.7MM interface), used for observing the lunar surface, planets, nebulae, star clusters, diffuse nebulae and other celestial bodies. It has high brightness, a large field of view, and is very comfortable to observe. The metal body is fully multi-layer coated, with excellent optical performance. - When used on an astronomical telescope, the smaller the focal length of the eyepiece, the greater the magnification. The larger the number of the eyepiece, the lower the magnification. During observation, a high-power telescope can observe details and other objects, while a low-magnification eyepiece can observe landscapes, nebulae and other objects with a wide area, making it easy to find detailed targets.