The Skywatcher 90 degree Amici prism with 1.25″ receptacles is intended for the observation of astronomical objects in the telescope. The 90° view makes it possible to easily observe objects at the zenith. You see the objects in the eyepiece upright and from the right side and have the usual orientation.This prism can also be used for terrestrial observation, but only makes sense for very high objects or, for example, flying birds.Scope of delivery: 1.25″ 90° Amici prism dust caps! Power supply and batteries are not included !