Used Celestron Ultima 18mm EyepieceFeatures Japanese made, this is a used, fully multi coated 18mm eyepiece with 1. 25 inch barrel. This is in very good, but used condition: the glass is clean, as is the barrel, which shows some wear. Ultimas are 5 element eyepieces, renowned for their incredibly sharp, bright, contrasty views, from edge to edge of its 52 degree field. Great on the moon and planets. Comes in original box; dust caps included. Weight: 3 oz.