When we talk about the objective lens of binoculars, we mean the front lens. The front lens is the foremost LensThe 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 of the lens.

The larger the lens diameter, the more light can be absorbed by the lens of the optical system. Glass purity plays a major role.

The 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 is the lens group of an optic that corresponds to 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 is facing the eyepiece. The eyepieces consist of several separate 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 - from achromats (3-6 individual lenses). 

The glass quality or type of glass is, in addition to the CoatingIf light hits a glass-air surface (e.g. with a roof prism), the reflection causes a loss of light. " More info of optics is one of the most important quality factors for binoculars and riflescopes

The MagnificationThe magnification of a binocular model is perhaps the most misunderstood feature. High magnification can be useful! " More info of a binocular model is perhaps the most misunderstood feature. High magnification can be useful!

If light hits a glass-air surface, e.g. 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), the reflection causes a loss of light.

If a shooter does not look "straight" but "diagonally" through the scope 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 infoa target error occurs - the so-called ParallaxIf a shooter does not look "straight" but "diagonally" through the telescopic sight eyepiece, an aiming error occurs - the so-called parallax. " More info.

Binoculars with porro prisms are the real universal binoculars, are inexpensive and offer brighter images with higher contrast.

Lenses have the property of imaging objects upside down and laterally inverted - therefore the image must be rotated again.

DifferenceDifference and comparison between Porro prisms and roof prisms The design of binoculars is always determined by the type of prism used. Porro prism in binoculars Binoculars with a porro prism design can be recognised by their relatively low height and wide design. Advantage: The greater distance between the two lenses promotes spatial vision. A graphic illustration and further details on the design of porro prisms can be found here! Roof prism with " More info and comparison of porroprisms to Roof prismsThe 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 The design of the binoculars is always determined by the type of prism used. Porro PrismBinoculars with porro prisms are the real universal binoculars, are inexpensive and offer brighter images with higher contrast. " More info Binoculars with a porro prism design can be recognised by their relatively low height and wide design. Advantage: The greater distance between the two lenses promotes spatial vision. A graphic illustration and further details on the design of porro prisms can be found [...]

For technical reasons, image sharpness decreases from the centre of the image to the edge with every lens (due to the shape of the lens).

Thanks to the DDoptics RNP coating of the outer lens surfaces WaterThanks to the DDoptics RNP coating on the outer lens surfaces, water does not adhere to the glass. " More info not on GlassIn 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.