If you like the website and want to contribute to the running costs then please do so below. All contributions are most welcome.

PayPal - The safer, easier way to pay online.

The final lens in an optical set-up such as a telescope or a pair of binoculars. Its purpose is to magnify the image that has already been brought into focus. The ocular lens in a telescope is the eyepiece. For a pair of binoculars they are simply referred to as ocular lenses.

A set of amateur telescope eyepieces

Glossary A B C D E F G H I J K L M N O P Q R S T U V W X Y Z