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cat. Chasse 2019 p.305

RTI 9 x 63 hut binoculars with cemented optical treatment

RTI Optics RTI Optics

RTI 9 x 63 hut binoculars with cemented optical treatment

Item number : OP1942

Item number Designation Category Length (cm) Width (cm) Height (cm) Weight (g) Magnification Min Objectif Diam. (mm) Color MSRP Stock
Item number OP1942 Designation RTI 9 x 63 hut binoculars with cemented optical treatment Category Free sale Length (cm) 27.5 Width (cm) 16.2 Height (cm) 88.2 Weight (g) 1360 Magnification Min 9x Objectif Diam. (mm) 63 mm Color Green MSRP 279 € incl. tax

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

Special gabion! Multilayer cemented optical treatment for maximum quality.

  • Wide aperture prism binoculars (63 mm) for low light observation.
  • Specifically studied for hut hunting (gabion) and animal watching.
  • Field of vision: 5.5 ° or 96 m to 1000 m.
  • Output pupillary diameter: 7 mm.
  • Adjustment by central wheel and right eye by rotary eyepiece.
  • Anti-shock green rubber coating.
  • Eye protection and lenses.
  • Folding rubber eyecups.
  • Screw in 1/4 '' photo for fixing on a tripod.
  • Cordura cover, carrying strap and 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.

Twilight index: 23.8.

Context : Hunting duck, ducks, waterfowl, sum, calvados, bunker, lookout, penumbra, daybreak, dusk ...
In France products of categories A, B, C or D are subject to rules of purchase, port, transport and detention. For more details please consult the link below.
Classification of weapons according to the French Internal Security Code

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The recommended retail prices are listed as a guide..
Pictures are not contractual. Photos of product may be different with the final products.