Influence of the optical Remuneration and coating on the quality of binoculars and riflescopes

High influence on the Optical quality and of course also to the Price of an optic (binoculars or telescopic sight) has the CoatingIf light hits a glass-air surface (e.g. with a roof prism), the reflection causes a loss of light. " More info the LensesThe use of aspherical lenses leads to a reduction in the overall length of the binoculars and in some cases to a significant reduction in weight. " More info. Especially here the big differences between good and cheap binoculars is visible especially for brightness and contrast.

Uncoated glass reflects (mirrors) approx. 4% of the light per glass-air transition.

A LensWhen we talk about the objective lens of binoculars, we mean the front lens. The front lens is the foremost lens of the objective. " More info consists of several lenses which means that some of these transitions exist in binoculars. For example, if you assume 7 glass elements per side (a 2-lens objective, 2 PrismsLenses have the property of imaging objects upside down and laterally inverted - therefore the image must be rotated again. " More info and a 3-lens EyepieceThe eyepiece is the lens group of an optical system that faces the eye. The eyepieces consist of several separate lenses - achromats (3-6 individual lenses). " More info), i.e. a perfectly normal combination, this means that only 56.5% of the incident light at the EyeThe retina of our eyes has two different types of sensory cells or receptors, the cones (for day vision) and the rods (for night vision). " More info arrive.

With the help of a already simple coating this loss of Light transmissionLight transmission is the ability of optical glass or optical systems to "let through" as many light rays as possible. " More info (transmission loss) is reduced to 1.5%, for example. This already increases the amount of light that reaches your eyes to around 80%. With a multi-coated lens the lenses are provided with several coating layers. This produces a much better result.

False light inside the binoculars

The "false light" in binoculars caused by mirroring (reflection) reduces the image contrast. If the properties of binoculars of Multiple coating and Multicoating does not automatically mean that all glass surfaces are multi-coated, but in any case important parts of them are.

In addition to the optical ones, the mechanical Properties of the coating of importance. Of course, this mainly concerns the coating of the outermost lens parts. Of course, you must not damage the coating when cleaning the binoculars.

Important: Cleaning must always be carried out carefully and with clean material. It is best to clean the binoculars beforehand with WaterThanks to the DDoptics RNP coating on the outer lens surfaces, water does not adhere to the glass. " More info Rinse well. It is always better not to clean than to clean with an unclean, dusty cloth!

Since the Coating a high influence on the Brightness, contrast and colour reproduction of binoculars, it is therefore advisable to pay special attention when cleaning them!

How do I recognise a coated lens on binoculars?

Take a look with a Light source in the back into the lens and move the binoculars slowly. If you have a blue colour shimmer, the lens is coated.
See one green shimmer with a hint of other colours, then the lens is at least double-coated.

Phase tempering of prisms

A very special form of coating is the Phase compensation. With a Roof prismThe main difference between the roof edge and the Porro system is the roof edge, where one of the reflective surfaces resembles a house roof (see picture below). " More info some of the light comes out of the prism with a phase shift (wavelength shift) and polarised. This is due to the optical construction of the prism and is at the expense of some of the light and therefore the brightness. We would like to prevent this. The problem is solved with Phase tempering on the roof prism solved. The used Glass typesIn addition to the coating of optics, the glass quality or type of glass is one of the most important quality factors for binoculars and riflescopes " More info also have a major influence on contrast and reproduction.

It should also be noted that with cheap binoculars the information given in the description Properties do not always apply. It happens that a "full multicoated" binoculars are in fact not fully coated after all or have a coating that makes you wonder whether it is beneficial to the image quality.