The Sky-Watcher 90 degree star diagonal with 2″ receptacles is a standard part for many telescopes. It enables a comfortable view of the telescope at the zenith. You see the objects in the eyepiece upright but inverted. An eyepiece adapter for 1.25″ eyepieces is included. Scope of delivery: 2″ 90° star diagonal with adapter to 1.25″ dust protection caps! Power supply and batteries are not included in the scope of delivery!