Swift Binocular Manual
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Sport Optics
Congratulations on becoming the owner of a Swift binocular!
Binoculars from Swift Sport Optics (Swift) are the result of years in research
and development, the sole purpose of which has been to design the finest,
most practical optics giving our customers the greatest value for their
purchase. Swift is committed to developing products that excels in quality
and performance. Only actual use, (and comparison with far costlier optics)
can truly demonstrate the extraordinary quality of workmanship and
materials which make these binoculars the most sound investment of their
kind.
Please note that all Swift Sport Optics binocular models undergo rigorous quality
control to check for alignment. With years of use, all binoculars will eventually drift
out of alignment and require collimation by an optical technician. Sudden drops,
bumps and bands to the binocular may cause the optics to fall out of alignment.
Re-alignment is not covered under the Swift Warranty
Swift Binocular Terms
PORRO PRISM
Cl Bo This style is especially suited for binoculars with
LL objective lenses of 44mm (millimeter) and larger. The
Ш traditional “M-shaped” in which the objective lenses
are spaced wider than the eyepieces offers two
3
| | prisms in each barrel
ROOF PRISM
The roof prism is a slimmer design, shaped -
somewhat like the letter "H and has a third prism to | -
direct the light over a longer optical path, yet keep the ||
binocular smaller and lighter in weight. ec Вест
MAGNIFICATION
Binoculars are labeled with numbers like 7x 50 or 8x 40 or 10x 50. The first
number refers to the magnification, or the number of times the binocular
magnifies an object. The x means times or “multiplication” just as in
arithmetic. For example, an object such as a bird, ship, or race horse that is
500 feet away will appear 1/7 of that distance (71 feet) in a 7x glass, 1/8 that
distance (62 feet) in an 8x glass, and 1/10 the distance (50 feet) in a 10x
binocular.
OBJECTIVE
The second number refers to the diameter of the objective lenses in
millimeters. The objective lenses are the large lenses on the front of the
binocular, the end closest to the subject. A glass with 50mm or larger
objective lenses will be fairly large and heavy, whereas a binocular with
21mm lenses will be small and compact.
EXIT PUPIL
The exit pupil is the small circle of light seen in the eyepiece when holding
the binocular at arms' length toward a light source such as the sky or a
light-colored wall. The larger the exit pupil, the more light that is admitted
too your eyes, the greater the detail, clarity, and resolution, especially in dim
light. Divide the objective size (second number) by
the magnification (first number) and you arrive at
the exit pupil. These two numbers together give
light gathering power of the binocular.
LENS COATINGS
Modern lenses are coated during manufacturing with a variety of lens
coating materials to eliminate lens aberrations, reduce internal reflections,
and screen out ultraviolet light. As a result, these lenses have a higher
Relative Light Efficiency (RLE). RLE is a measure of brightness used to
compare different binoculars. Note, coatings may not be added after
manufacturing.
Coated Lens Uncoated Lens
FIELD OF VIEW
The Field of View (FOV), expressed either in degrees or in feet at 1000
yards, measures the area that the binocular can view at one time. Consider
a ship that is 500 feet long bow to stern, 1000 yards away. A wide-field
binocular with a FOV of 500 ft @ 1000 yards, would allow you to view the
entire ship at once. A binocular with a FOV of 375 ft @ 1000 yards, would
not take in the entire length of the ship. Similarly, at a sporting event, a wide
FOV will take in a greater span of the playing field than a narrow FOV.
Binocular Settings
To get the sharpest image at the most comfortable view, it is necessary to
properly set the binocular to accommodate your eyes. This is done by first
adjusting for your interpupillary distance or the distance between your eyes.
INTERPUPILLARY ADJUSTMENT
1. Hold the binocular comfortably to your eyes in a normal viewing
position.
2. With a firm grip on the barrels, move the barrels in an arc like motion
closer together or further apart until you see a single circular field.
It is important to set the binocular to this position before use to reduce
eyestrain and fatigue.
DIOPTER ADJUSTMENT
When focusing, it is necessary to correct the differences in sight between
each eye. This individual eye correction is known as the Diopter Adjustment
and Is accomplished in different ways on different binocular models. Please
see the Product Information Card for the type of diopter adjustment found on
your binocular model.
CENTER FOCUSING WITH RIGHT DIOPTER ADJUSTMENT
1. “Set the adjustable right eye diopter ring tozero or “f
center index mark. |
2. Leaving both eyes open, cover the right objective
lens with a plastic dust cover and focus the left eye | |
with the center focus knob. | : dl
3. Then cover the left objective with the dust cover and focus the right
eye by only turing the diopter ring.
Note the index mark on the right eyepiece so that in the future, you do not
have to repeat the entire procedure; you simply set the right eyepiece at this
mark and use the center knob for focusing.
— —] " "Ч
COMBINATION CENTER FOCUS/DIOPTER ADJUSTMENT
Some of the latest Swift Sport Optics binocular models have a left eye
diopter adjustment which is controlled from the center focus knob.
— ==
1. First, grasp the top of the center focus knob and "e |
pull up, this is the diopter ring. The diopter ring - ==
==
eyepiece. | |
——
will then turn independently to adjust to the left
2. Leaving both eyes open, cover the left objective
lens of the binocular with a dust cover, and use
the bottom portion of the center focus knob to focus the right eye.
3. Then, cover the right objective lens with the dust cover, and turn the
diopter ring to focus the left eye.
4. Press down the diopter ring to lock the diopter setting in place. When
locked the center focus knob will continue to work as a complete unit.
EYECUPS
To take advantage of the full field of view that the binocular offers, your eyes
must be the proper distance from the eyepieces. This distance is known as
the Eye Relief or Eye Point. Your Swift binoculars have rubber, pop or twist
eyecups that fit comfortably against your eyes and place your eyes at the
proper distance. For eyeglass wearers, make sure that eyecups are folded
or twisted down so that your eyes will be close enough to the eyepiece. See
the Product Information Card for the type of eyecups found on your
binocular.
DUST COVERS and RAINGARDS
Swift binocular models come with either plastic dust covers that fit over the
individual eyepieces and objective lenses or rainguards which fit over both
eyepieces and usually attach to the binocular strap to protect them when not
in use.
TRI-POD SOCKETS
Most Swift binocular models are available with a tri-pod mount. Tri-pod
screw sockets are on the center post of the binocular. This is protected by a
cap to keep the threads free of dust and dirt. The socket will accept a
special mounting bracket that connects to any standard camera tri-pod.
WATERPROOF/FOGPROOF MODELS
Swift waterproof/fogproof binocular models are filled with a nitrogen gas
mixture and sealed with neoprene gaskets and O-rings. The gas is non-
corrosive and completely free from moisture, ensuring that there will be no
moisture inside the binocular to create fog, even when sudden drops in
temperature create fog in ordinary models, rendering them useless. These
special seals and gaskets also insure the binocular can resist rain and
occasional shallow submersion. It is important to note that most Swift
binocular models are designed to be waterproof to a depth of one meter for
five minutes. To determine if your binocular is waterproof see the enclosed
Product Information Card.
MAINTENANCE
Please clean the lenses of your binocular as you would a camera. First, use
air or a soft brush to remove dust particles and dirt from the lens. Then, use
only soft tissue or an approved lens cloth with an approved lens cleaning
solution (non-ammonia). Start from the center of the lens and gently wipe In
a circular motion from the center to the outer edge of the lens. Gently dry
binocular lenses after use in damp weather as raindrops, or other moisture,
may leave a permanent stain if it remains on the lens.
Please note that all Swift Sport Optics binocular models undergo rigorous quality
control to check for alignment. With years of use, all binoculars will eventually drift
out of alignment and require collimation by an optical technician. Sudden drops,
bumps and bands to the binocular may cause the optics to fall out of alignment.
Re-alignment is not covered under the Swift Warranty.
WARNING
Never disassemble lenses, as removal of a lens from its cell destroys the
waterproof seal and void the Swift warranty. For complete details on the
Swift warranty see the enclosed Product Registration cara.
Porro Prism Binocular
— Eyecups
Center Focus
| Tri-pod Mount |
Objective | |
Lenses
Roof Prism Binocular Eyecups
Center Diopter d
Adjustment Er Er
o ”
Center Focus o v
Objective Lenses
Swift Sport Optics, LLC ~~ 12105 W Cedar Drive = Lakewood, CO 80228
877.MY SWIFT (697.9438) e www.swift-sportoptics.com
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