Binoculars 10X42 Waldberg

Name: BINOCULARS 10X42 WALDBERG
Brand: Waldberg
SKU: 167523
Rating: 5 (1 reviews)

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~~£131.37~~

Chasseur.com price 2023

Recommended retail price : £131.37

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Reference

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Magnification/lens

Length (cm)

Weight (g)

Price inc VAT

OP1791

~~£131.37~~

10x42

659

~~£131.37~~

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binoculars for all terrains with shockproof rubber coating and anti-slip studs.

features :
• optics treated with multi-coated anti-reflective finish.
• twist eyecups suitable for eyeglass wearers.
• nut for tripod mounting at the front of the axis.
• exit pupil diameter : 4. 2 mm (the larger this diameter is, the more comfortable observation will be in low light)
• twilight factor : 20. 5 - brightness : 27. 6

supplied with case, strap and lens cloth.
calculation of the twilight factor : square root of the product of the magnification and the diameter. for 8x42 binoculars, it is therefore the square root of 8x42, that is the root of 336 = 18,3.

the higher the twilight factor, the better. indeed, the higher this factor is and the more details will be perceived. there is yet another criterion for binocular clarity : brightness.

brightness is obtained by squaring the diameter of the exit pupil (42/8=5,25 mm), that is by multiplying it by itself. in our example, the relative brightness is : 5,25 x 5,25 = 27,6. the higher this value is, the better. when it is below 15, the binoculars are mainly suited to daytime use.

binoculars showing a twilight factor above 25 can be called night binoculars. the limit is however blurred. a high twilight factor combined with low brightness (12x40 binoculars have a twilight factor of 21,9 but a brightness of 11,1) will be difficult to handle.