The Ostara HR 20mm Plossl Eyepieces has a high optical and build quality. It is fully coated to minimize the reflections while enhancing light transmission with standard astro 1.25" fitting. Additionally, it is suitable for the majority of astronomical scopes and some spotting scopes. Supplied in plastic cases for protection or storage. Eyepiece design may vary from image. The eyepieces furnish a wide field of view and are therefore ideal for a wide range of observational applications such as planetary and deep-sky viewing.