GSO 2″ mirror star diagonal are of extreme goodt mechanical and optical quality at a low price. The body is an all metal (aluminum) construction. A star diagonal mirror to be used with standard 2″ focusers on any telescope with sufficient focus travel, like most Refractors and Maksutov-Cassegrains. The 2″ barrel with 48mm thread, it is convenient to fits with most brand 2″ filter.Add to Cart