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Night Vision Sales
Terminology
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 Night Vision, Day/Night Scopes or state-of-the-art Day Time
Riflescopes ATN has 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
contains many special Night Vision terms. Here we show the description of
the 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 รท 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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