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Also known as binoculars. It is an observation instrument composed of two telescopes with the same performance that meets the requirements of people's eyes. It is a basic military observation instr...

Binoculars, also known as "binoculars". A telescope consisting of two monoculars juxtaposed. The distance between the two eyepieces can be adjusted so that both eyes can observe at the same time, t...

Scopes are mainly divided into the following three categories: Telescopic sight, Collimating optical sight, and Reflex sight. Among them, telescopic sights and reflective sights are the most popula...

By the 40s of the 19th century, some American gun mechanics began to manufacture firearms with optical sighting devices. In 1848 Morgan James of New York designed a tubular sighting device of the s...

The origins of the scope, or optical sight, are difficult to verify. It is said that at least in Europe in the 16th century, attempts were made to fix spectacle lenses on the butt. It is written th...

Observation method 1: let the magnifying glass close to the object of observation, the observation object does not move, the distance between the human eye and the observation object remains unchan...

In order to see the details of tiny objects or objects, it is necessary to move the object closer to the eye, which can increase the angle of view and form a larger real image on the retina. But wh...

Magnifiers are simple visual optics used to observe the tiny details of an object, and are converging lenses with a much smaller focal length than the photopic distance of the eye. The magnitude of...