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cat. Chasse 2019 p.306

Folding binoculars RTI 10 x 25

RTI Optics RTI Optics

Folding binoculars RTI 10 x 25

Item number : OP175

Item number Designation Category Weight (g) Magnification Min Objectif Diam. (mm) Color MSRP Stock
Item number OP175 Designation Folding binoculars RTI 10 x 25 Category Free sale Weight (g) 320 Magnification Min 10x Objectif Diam. (mm) 25 mm Color Black MSRP 42 € 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!

  • Excellent image quality, long service life and very good reliability even in difficult conditions.
  • The lenses and prisms are made with very high quality glass, multilayer treated.
  • Reduced weight and pleasant, ergonomics studied for a fatigue-free observation, folding eyecups.
  • Field at 1000 m: 101 m.
  • Output pupillary diameter: 2.5 mm.
  • Type of prism: roof.
  • Twilight index: 15.8 - Brightness: 6.25.
  • Supplied with Cordura cover.

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 : 10 x 25 binoculars, hiking binoculars, binoculars for kids, pocket binoculars, binoculars to slide in a backpack.
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.