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cat. Chasse 2020 p.314

Binoculars 10 x 42 Waterproof

Binoculars 10 x 42 Waterproof

Item number : OP01952W

SKU Item designation French Law Weight (g) Magnification Min Objectif Diam. (mm) Colors MSRP Stock
SKU OP01952W Item designation Binoculars 10 x 42 Waterproof French Law Free sale Weight (g) 650 Magnification Min 10x Objectif Diam. (mm) 42 mm Colors Green MSRP 185 € incl. tax
Disponible

The available products can be ordered by your gunsmith who will be delivered in 24 / 48h, out of stock products are being replenished, but your gunsmith may have in stock, ask!

Versatile hunting binoculars!

  • Roof prism, anti-shock rubberized body, telescopic eyecups by screwing, multilayer treatment, good optical quality.
  • Twilight index: 20. 5 - brightness: 27. 6.
  • Field at 1000 m: 101 m.
  • Output pupillary diameter: 4.2 mm.
  • Comes with a binocular strap, a case strap, a Cordura case and an optical cloth.

Calculation of the twilight index: square root of the product of magnification and diameter. For 8x42 binoculars, this is the root of 8x42, that is, the root of 336 = 18.3.

The higher the crepuscular index, the better. Indeed, the higher this index is, the more we will see details. There is another criterion for binocular clarity: brightness.

The brightness is obtained by squaring the diameter of the exit pupil (42/8 = 5.25 mm), that is to say by multiplying it by itself. In our example, the relative brightness is: 5.25 x 5.25 = 27.6. The higher this value, the better. When less than 15, binoculars are especially suitable for daytime use.

Binoculars with a twilight index greater than 25 may be called night binoculars. The limit is however fuzzy. A high crepuscular index combined with low brightness (12x40 binoculars have a twilight index of 21.9 but a brightness of 11.1) will be difficult to handle.

Context : Hunting binoculars, hunting binoculars, hunting binoculars, good pair of binoculars, quality binoculars, observation binoculars, pair of binoculars.
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