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.1.25in nosepiece fits telescopes with 1.25in focusers. Accepts standard 1.25” eyepieces, filters, Barlow lenses and other accessories with a 1.25in insert barrel.