This in turn largely determines the brightness of the image that you see. One or more surfaces of one or more lenses have been coated with multiple films. Because of their ability to filter out uncomfortable red light and provide brilliant daylight viewing, this is especially suited to binoculars being used to view objects over water, snow or other bright conditions. Removes the glare resulting from excess ultra-violet rays in the atmosphere providing a clearer more vivid image especially in brilliant sunlight. Optical Systems and Binocular Size.
Light enters the objective lenses and travels via prisms to the eyepieces.
A distinctive Z shape characterised internally by the use of a combination of two right angle porro prisms and externally by the offset positioning of the eyepieces from the objective lenses. Roof prism design. With the prisms positioned one over the other, the objective lenses and the eyepieces are in line. The result is a more compact design which allows compact binoculars to have full size power capabilities. By altering the design and shape of the binocular s lenses an increased Field of View can be obtained without sacrificing power.