Almost from the invention of the telescope in the 17th century the advantages of mounting two of them side by side … See more

The optical system of modern binoculars consists of three main optical assemblies:
• Objective lens assembly. This is the lens assembly at the front of the binoculars. It gathers light from the object and forms an image at th… See more

Binoculars are usually designed for specific applications. These different designs require certain optical parameters which may be listed on the prism cover plate of the binoculars. Those parameters are:
Given as th… See more

Binoculars have a focusing arrangement which changes the distance between eyepiece and objective lenses or internally mounted lens elements. Normally there are two different arrangements used to provide focus, "inde… See more

Because a typical binocular has 6 to 10 optical elements with special characteristics and up to 20 atmosphere-to-glass surfaces, binocular manufacturers use different types of optical coatings for technical reasons and to improve … See more