Shop at Amazon US

Contributions

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 distance the eye is positioned from the eyepiece lens at which you can see a full field of view. Long eye relief eyepieces (20mm or so) are required for glasses wearing observers.

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