Influence of objective lens diameter on the light intensity of the binoculars or on the objective lens light intensity

The "second" code number (e.g. ..x50) indicates the diameter of the Front lens of the objective (usually the larger diameter) in mm. The larger this diameter is, the more light can be 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 of the optics.

While during the day a 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 of 20mm is sufficient, a larger diameter in the TwilightFor night glasses, which are ideal for sitting game and as sow glasses, the light intensity is the most important feature. " More infothat more of the remaining light can enter the binoculars. If the lens diameter is doubled (e.g. from 25mm to 50mm), 4 times the amount of light can be recorded.

Larger lens diameters unfortunately also lead to an increase in the weight of the optics. 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 has its weight! In practice, objective lens diameters of up to 56mm are the rule for binoculars and riflescopes. A selection of DDoptics fast binoculars, sorted by objective lens diameter, can be found here:

Luminous intensity	Lens	Utilisation
low	25mm	Ideal for normal lighting conditions
medium	32mm	Ideal until dusk
medium higher	42mm, 45mm	Ideal until (late) dusk
high	50mm, 56mm, 60mm	Astronomy, in dark light conditions - in the evening and at night