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Exit pupilIn addition to the twilight number, the binocular exit pupil at the eyepiece of the binoculars is also very important for seeing in twilight (twilight vision). " More info Binoculars - meaning and calculation For seeing in the TwilightFor night glasses, which are ideal for sitting game and as sow glasses, the light intensity is the most important feature. " More info (twilight vision) is of great importance, in addition to the Twilight numberIn order to be able to recognise details over long distances even in twilight, binoculars with high magnification and corresponding twilight performance (e.g. 10x56 or 8x56) are recommended. " More infothe binoculars exit pupil on 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 of the binoculars. The following applies: the larger the diameter of the exit pupil, the greater the theoretical image brightness in the binoculars. 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. Calculating the exit pupil To determine the exit pupil of binoculars, calculate the quotient of binoculars EnlargementThe magnification of a binocular model is perhaps the most misunderstood feature. High magnification can be useful! " More info and Lens diameterThe larger the lens diameter, the more light can be absorbed by the lens of the optical system. Glass purity plays a major role. " More info: With binoculars 8x56 calculated [...]