Optics Glass types for optical devices
Influences of different glass qualities such as BK7 or BAK4 in binoculars and riflescopes
The Glass quality or glass type is next to the CoatingIf light hits a glass-air surface (e.g. with a roof prism), the reflection causes a loss of light. " More info from Optics one of the most important quality factors for binoculars and riflescopes
The optical system of binoculars consists of Glass lenses or possibly plastic lenses in the case of cheap optics constructed. A manufacturer can choose from many different types of glass (qualities).
ED Glass
Extra Low dispersion glassED glass effectively compensates for chromatic aberration (chromatic aberration = different coloured parts of a light beam are refracted to different degrees - can be clearly seen as a colour fringe along edges) " More info is a Special glass with very low refractive power and one low dispersionThis makes it easier to eliminate problems caused by chromatic aberration.
BK7 and BAK4 glass
The PrismsLenses have the property of imaging objects upside down and laterally inverted - therefore the image must be rotated again. " More info in a telescope can be made from BK7 glass exist. This is ordinary barium Crown glassThe different types of DDoptics binoculars Binoculars can be divided into two main types according to their basic construction: Construction with roof prism (different types of construction) or with Porro prism. Both designs have their unique advantages and disadvantages. In principle, Porro and roof prism binoculars can offer the same performance depending on the type of glass (BAK 4, crown glass, etc.), the amount of coating required and the manufacturing quality. The details decide whether they are good binoculars or not. " More info, which is perfectly suitable for the production of an average quality prism.
Much better and therefore used for the highest quality optics (which are unfortunately also much more expensive) is the much more powerful BAK4 barium crown glass.
The The choice of glass for binoculars is therefore largely determined by the optical requirements. determined. Of course, the Choice of glass type has a direct influence on the price of the end product. The manufacture of binoculars remains a compromise!
But the difference in quality between binoculars with inferior optics and binoculars with top-of-the-range optics cannot be overlooked. Contrast and detail reproduction can be worlds apart. lie.
