This precision 90-deg star telescope diagonal features fully coated prisms, delivering superior image fidelity. Housings are plastic with thumbscrew to secure the eyepiece in place. This 90-deg diagonal yields correctly oriented images (right-side up and nonreversed). It's perfect for terrestrial use or for amateur astronomers who want a view that matches the orientation of a star chart. Requires no extra focus travel.

Please note this product was not designed or intended by the manufacturer for use by a child 12 years of age or younger.