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 is, the more light can be absorbed by the lens of the optics. While during the day a Lens diameterWhen 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 20 mm 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 infowhich allows more of the remaining light to enter the binoculars.

If the lens diameter is doubled (e.g. from 25 mm to 50 mm), 4 times the amount of light can be recorded. Unfortunately, larger lens diameters 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 norm for binoculars and riflescopes. A selection of DDoptics fast binoculars, sorted by objective lens diameter, can be found here:

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

Selection of binoculars & riflescopes with different objective lens diameters in the DDoptics optics shop

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DDoptics V10 2-20x50 NXT riflescope MRAD A4N

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2,5-15x50

DDoptics riflescope V10 2-20×50 NXT MRAD | A4N ReticleDifferent reticles for riflescopes. DDoptics uses the following 3 reticles for its riflescopes, depending on the target optics: " More info