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American Technologies Network Corporation Manufactures and Distributes the
widest array of Night Vision Equipment in
the world. With over 150 models to choose from in I2 Night Vision, Day/Night Scopes or
state-of-the-art Day Time
Riflescopes ATN got you cover 24/7. For Pro or novices alike you will
find the best whether you are looking for Night
Vision Monoculars, Night
Vision Goggles, Night
Vision Binoculars, Night
Vision Weapon Sights, advanced Day/Night Vision
Systems.
Descriptions and Specifications of all Night Vision
Equipment contain many special Night Vision terms. Here we show the
description of most often used terms.
Magnification: is
simply the degree to which the object is enlarged. With a 7x35 binocular, for
example, the object appears to be seven times closer than without the aid of a
binocular. The number immediately following the "x" is the diameter in
millimeters of the objective (front) lens. A 10x50 binocular, therefore, has a
10 times magnification with a 50mm objective lens.
Field of View
(FOV): The field of view is the width, measured in degrees or feet, of
the viewing area you would see at 1,000 yards.
Bright Source or
Over-Light Protection: An electronic circuit that turns the power to
the night vision device down or off when it is exposed to bright light (such as
automobile headlights). This protects the image intensifier and extends its
life. The device will revocer and resume normal operation in 1-2
minutes.
EyePiece Focus: Used to match your night vision
scope or binocular to your specific eyesight.
Image Intensifier
Or Intensifier Tube: The active component in a night vision system that
amplifies light and presents a usable image.
Infrared (IR)
Illuminator: Provides a light source for the system to amplify,
yielding enhanced images in very low light conditions such as caves where no
ambient light is available for amplification.
Objective
Lens: Collects all available light and focuses it on the image
intensifier. It also provides image magnification.
Phosphor
Screen: Positioned at the back of the intensifier tube, the green
phosphor screen renders a visible night vision image. The human eye is most
sensitive to green contrasts.
Photocathode: Converts
light (photon energy) into electrons (electrical energy) which are then
amplified in the intensifier. The objective lens focuses available light on the
photoelectric surface of the photocathode, which is excited and passes electrons
within the tube.
Resolution: A measure of the ability to
render and display a detailed image. Image intensifier resolution remains
constant and is expressed as the maximum number of line pairs per millimeter
(LP/MM) that can be discerned when a black-and-white stripe pattern is focused
on the photocathode.
Exit Pupil: The exit pupil refers
to the size of the shaft of light transmitted to the eye. The more light, the
better the contrast. You can actually see the exit pupil by holding the eyepiece
of the binocular approximately 12 inches from your eye. It is the bright circle
of light in the center of the eyepiece. Exit pupil is expressed in millimeters
and is normally derived by dividing the power into the objective lens diameter.
A 7x35 binocular has an exit pupil of 5mm (35 ÷ 7).
Prism
Systems: Binoculars have left and right side barrels linked to each
other by an axle. The two most frequently used prism systems are porro and roof.
Porro Prism binoculars are characterized by the eyepieces being offset from the
objective lenses. Roof Prism binoculars feature lenses positioned in line for a
more compact design.
Coated Optics: Optical glass
surfaces are coated by magnesium fluoride to reduce light loss and glare due to
reflection. Most binoculars are fully multi-coated to further enhance viewing
and reduce eye strain. Some binoculars have a special image enhancing, amber,
high contrast coatings.
WaterProof: This describes a
binocular's ability to remain completely dry on the inside when exposed to
moisture or total submersion in water. Binoculars are sealed with O-rings and
are filled with 100% arid nitrogen, which also resists all forms of
moisture.
Stray Light: When light entering the
binoculars reflects off of interior surfaces, the reflected light eventually
exits inside the binoculars in the form of stray light. This unfocused light
typically diminishes the image quality of the sight picture.
Focusing Range: All binoculars have the ability to be
focused for infinity. So a primary point of distinction between binocular models
is the minimum focus range. Birders tend to favor models with a short focus
range of about 15 feet, but 20 to 25 feet is usually
acceptable.
Twilight Performance: Using the below
formulas gives a basic evaluation of low light performance, however, one must
keep in mind that they are mathematical formulas and do not take into effect
some of the most critical features in optics: glass quality, number of lenses,
precision of manufacturing and coatings.
Spotting Scope Terminology
The spotting
scope you choose greatly affects how it will work for you under certain
conditions. For example, the person who only wants to use his or her spotting
scope at the rifle range can often drive up to the bench and conveniently layout
supplies including a large objective porro prism spotting scope. The target
shooter could easily use a 80MM porro prism scope on a full-length tripod and
not worry about compact design or lightweight since their automobile is a few
yards away. On the other hand, a person who is planning an elk hunt is probably
very concerned with weight and the ability to fit the scope into a pack.
Typically roof prism spotting scopes offer the hunter or backpacker a more
compact and lightweight design to pack and carry long distances. While some
porro prism spotting scopes are quite compact, others can offer larger fields of
view and resolution, but they may not be practical to pack into the woods. Other
features for the hunter to consider are rubber armoring to protect the scope
from blunt force. A waterproof spotting scope offers piece of mind to the hunter
working in rain and snow. This is not a comprehensive list of all the factors to
consider when choosing a spotting scope but it will hopefully shed some light on
some of the more critical factors to
consider.
Magnification: The magnification feature of a
spotting scope allows the user to view an object much closer than it would
otherwise be using only the human eye. The magnification power is a function of
both the scope's optical system and the eyepiece being
used.
Objective Lens Diameter: The objective lens of a
spotting scope serves to gather incoming light. A 60mm objective lens will
gather more light than a 50mm lens. When more light is transmitted to your eye,
you will view a brighter and clearer image. Resolution (ability to see detail)
is also a function of the objective lens diameter.
Eye Relief:
Eye relief is the minimum distance between the spotting scope eyepiece and your
eye that still allows you to see the entire field of view. Hunters and shooters
who do not wear eyeglasses can use most spotting scopes and eyepieces without
any trouble. People who wear eyeglasses are more concerned with eye relief. When
a person wears glasses while looking through a standard spotting scope eyepiece
their glasses may touch the eyepiece. The need for eye relief is an individual
specific need. Sometimes eyeglass wearers are more comfortable looking through a
spotting scope without their glasses on.
Optical Lens
Coatings: Lens coatings play an important role in getting the light
gathered at the objective end of the scope transmitted through the ocular end to
your eye. The lens coatings are partially responsible for delivering a brighter
and higher contrast image.
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