This 102mm compact refractor is a dual-purpose telescope for terrestrial and astronomical observation. SV503 telescope is ideal for terrestrial,viewing wildlife, scenery; casual astronomical observation such as the Moon, star clusters and brighter deep sky objects like the Andromeda Galaxy at night.SVBONY SV230 super zoom eyepiece provides you with a wide range of magnifications all combined in a single eyepiece. It is convenient to observe planet. Wide angle eyepiece, expand the view of sight; Wider coverage, compatible with more brands; Output images without edge distortion. The aspherical lens is designed to eliminate edge distortion, it has resolved the persistent issue of subpar edge image quality associated with wide-angle eyepieces, thereby transcending the visual constraints experienced by users.