Wide Angle 76 Degree BAK 4 Porro Prism Binoculars 8x Magnification

8x40mm Porro Prism Binoculars 8x Magnification 40mm Objective Wide Angle 76° BAK-4 prisms

The 8-power wide-angle binoculars are excellent for birding, nature viewing or sporting events!
High-quality BAK-4 prisms and fully multi-coated eyepiece and objective lenses ensure maximum image quality
Long 26mm eye relief lets eyeglass wearers leave their glasses on and take in the full field of view
Rugged cast-metal alloy body stands up to field use; rubber armored for a secure grip
Includes soft case to store and transport the binoculars, a deluxe wide neck strap and lens caps

Real field of view
Real field of view is the angle of the visible field, seen without moving the binoculars, measured from the central point of the objective lens. The larger the value is, the wider the viewfield available. For example, binoculars with a wider field of view are advantageous for locating fast-moving wild birds within the vertical viewfield. This also applies for finding small nebulas or a cluster of stars in astronomical observations.

Apparent field of view is the angle of the magnified field when you look through binoculars.

The larger the apparent field of view is, the wider the field of view you can see even at high magnifications.

With the conventional method used previously, the apparent field of view was calculated by multiplying the real field of view by the binocular magnification. (With this formula, apparent field of view wider than 65˚ is called wide field of view.)

Porro prism binoculars can be identified by their offset tubes; the objective lens is not in line with the ocular lens. The front lenses are usually closer together than the rear lenses, but the reverse can also be true, particularly in compact models. The Porro prism design is usually optically superior to the roof prism design, especially in medium priced class binoculars. Porro prism binoculars have a single pivot between the two halves of the binocular, and are therefore easy to adjust for the distance between your eyes.

Rugged Waterproof, Fog proof Construction. Bright, Multicoated Optics. Long Eye Relief for Eyeglass Wearers. Rubber Armored. Multi-Click BaK4 High Index Prisms.

Prism Coatings
Multilayer coating is also applied to prisms to raise transmittance. A roof prism system has one surface that does not feature total internal reflection, so vapor deposition with metals, etc. must be used to raise the reflectivity of this surface. Also, phase-correction coating on roof surface ensures high-contrast images.

Specification

From finding the trail less traveled to perfecting your shot — you belong outdoors. we develop optics gear to empower you to get out and experience your passion, because we love the outdoors as much as you.BCI GROUP LTD.. NEVER MISS

BCI Group Ltd has been the key manufacturer of optics for more than 20 years.Our guiding principle is to provide our customers with the highest quality optics products,we have successfully created a complete range of optical products from outdoor pursuit for spectator sports,hunting,birding and boating to indoors and more.

We constantly increase investment in our three modern factories located in Mainland China to advance technology and product quality to meet our customer’s needs. A combination of advanced facilities and excellent management experts enable us to develop and manufacture a complete range of unique , reliable and innovative optics products.

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