Another simple two-element eyepiece generally found today only on cheap telescopes.

Very inexpensive two-element eyepiece. Today, only found on very inexpensive telescopes.

A type of eyepiece. Very limited features. Cheap.

Ramsden is a lunar impact crater located on the western stretch of the Palus Epidemiarum. To the east-southeast is Capuanus crater, and to the north lies Dunthorne crater.