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.

One of three basic optical designs in modern binoculars. The Porro prism is the traditional design in which the eyepieces are closer together than the objective lenses.

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