Used Celestron Ultima 12.5mm EyepieceFeatures Japanese made, this is a used, fully multi coated 12. 5mm eyepiece with 1. 25 inch barrel. This is in excellent condition: the glass is clean, as is the barrel. This includes two dust caps and the original box. 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.