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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

MSRP From : 250.00 € incl. tax
Item number : OP1942
Item number Designation Category Length (cm) Width (cm) Height (cm) Weight (g) Magnification Min Objectif Diam. (mm) Color MSRP Stock
OP1942 RTI 9 x 63 hut binoculars with cemented optical treatment Free sale 27.5 16.2 88.2 1360 9x 63 mm Green 250 € incl. tax
Disponible

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 ...

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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.