Barska Binoculars Barska Binocular User Manual

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RIF L ESC OPE TER M INO LO GY
A riescope is used to view distant targets and surrounding
objects to appear closer, and also indicates a bullet’s point of
impact. A riescope can provide a safer and more accurate
shooting.
MAGNIFICATION (POWER)
Magnication is the number of times the object being
viewed is enlarged. Riescopes are often identied by two
numbers, for example: 6x42. The rst number indicates the
magnication or the power of the riescope, expressed by
the letter “x”, for times. This means that the object being
viewed appears to be 6 times closer than would be seen
with the naked eye.
VARIABLE POWER/ZOOM: Zoom is the ability of the
riescope to change magnication continuously throughout its design
range, providing a low power to high power range. For example, a
6-24x50mm riescope has the ability to magnify an object from 6 to 24
times.
Low Power: Eg. 1.5-6x42, 2-7x32.
These riescopes are ideal at close range and for shooting moving targets.
Medium Power: Eg. 3-9x50, 2.5-10x50.
These riescopes are ideal for big-game hunting at medium range.
High Power: Eg. 6-24x50
These riescopes are best for target shooting, small-game
and varmint hunting.
OBJECTIVE LENS DIAMETER:
The second number in the reference (i.e. 6x42) indicates the diameter of
the objective lens or the front lens. The larger the objective lens, the better
the light transmission, thus the brighter the image.
OPTICAL COATINGS:
Various coating processes on the lenses and prisms will determine the
brightness and the light gathering of a riescope thus providing higher
contrast and brighter images. The different types of coatings are:
Coated = A single layer on at least one lens surface.
Fully Coated = A single layer on all air-to-glass lens surfaces.
Multi-Coated = Multiple layers on at least one lens surface.
Fully Multi-Coated = Multiple layers on all air-to-glass surfaces.
FIELD OF VIEW (F.O.V):
The side-to-side linear measurement of the circular eld seen through a
riescope. It is dened by the width in feet of the area visible at 100 yards,
or in meters at 100m. The higher the magnication, the narrower the eld
of view.
RESOLUTION:
The measurement of the riescope’s ability to distinguish ne detail and
sharpness.
EXIT PUPIL:
This refers to the size of the small disc of light that exits a riescope. To
determine the size, divide the objective lens diameter by the power. For
example a 6x42 riescope will have an exit pupil of 7mm. (42/6=7).
EYE RELIEF:
This is the distance a scope can be held away from the human eye and
can still observe the entire eld of view. Long Eye Relief (LER) reduces
eyestrain and provides an extra margin of comfort and safety.
TUBE DIAMETER:
This refers to the diameter of the body of a riescope; that portion between
the belled ends.
WATERPROOF/FOGPROOF:
Riescopes can be O-ring sealed for complete waterproof protection, and
fogproof which means that they are nitrogen-purged to prevent fogging
inside the optical surfaces. These models are able to keep completely dry
inside after immersion in water, thus suitable for all weather conditions.
PARALLAX:
A condition that exists when the image being viewed through a riescope
is not focused precisely on the reticle. Parallax can be detected by an out-
of-focus image or moving image in relation to the reticle as you move your
eye left to right, up and down while looking in the scope. Scopes with an
adjustable objective or turret provides the advantage of parallax correction.
PRECISION ADJUSTMENTS:
The windage and elevation adjustments affect accuracy and are used to
zero-in on the scope. Windage is the horizontal (left-to-right) adjustment,
usually the side turret of the scope. Elevation is the vertical (up-and-down)
adjustment, usually the top turret of the scope. Adjustments are usually
measured in click value. (1/4 MOA = 1/4” at 100 yards) for ner precision.
RETICLES:
A reticle is the crosshair or pattern placed within the scope, creating a
center point to facilitate aiming at a specic object. Certain reticles can
also be used to measure distance.
Riescope Limited Liftime Warranty
(Within USA and Canada only)
This warranty does not cover consumer-caused damages, abuse, normal
wear-and-tear, unauthorized repairs or modications. For further detailed
information, please refer to the warranty policy enclosed with products.
w w w . b a r s ka . c om
2011 BARSKA Sport Optics Catalog | Riescopes
*Models May Vary
IR Designator
5

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