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Binocular
FACTORS TO CONSIDER
Binocular performance balances on three legs. Magnification (how close it makes things appear), Resolution (sharpness and clarity) and Light Transmission (brightness). Ignoring a single leg of the performance tripod at the expense of the others erodes a binocular's optical quality. Powerful magnification is useless if the image is dim or fuzzy. A larger binocular may provide greater magnification, but it requires larger objective lenses to enhance resolution and brightness. When considering brightness, there are limits to the amount of light the eye can receive. During the day, it needs to eliminate some light, while at night it needs to transmit more. Therefore, some larger objective binoculars are ideal for night while smaller objective binoculars are better for day. Most importantly, know the intended use and try before you buy.
Magnification or Power: Binoculars are referred to by a combination of numbers, e.g., 7x 35mm. The first number refers to the power of the binocular. It indicates the size to which an object is enlarged.
Resolution: Resolution is a measurement of the binocular's ability to distinguish fine detail. Better resolution also provides more intense color. Resolution varies directly with the size of the objective lens. All else being equal, a larger objective lens will always deliver more detail than a smaller one regardless of the magnification. Actual resolution hinges on a variety of factors: the quality of the optical components, light transmission through the binoculars, existing atmospheric conditions, optical and mechanical alignment (collimation) and visual acuity of the individual.
Light Transmission: The size of the objective lenses determines the amount of light that reaches the eye. The larger the objective lenses, the greater the brightness and sharpness of the image seen through the binocular.
GLOSSARY OF TERMS
Coated Lenses: This means that some lens and prism surfaces are coated to produce a reasonably bright image at a modest cost.
Exit Pupil: The exit pupil diameter is the number attained by dividing the objective lens diameter by the magnification. The exit pupil appears as the bright circular area inside the eyepiece. The larger the exit pupil, the better it is for use in poor light.
Field of View: The field of view is the width in feet/meters of the area you can see from a distance of 1000 yards/meters away.
Fully Coated Lenses: All air-to-glass surfaces are coated for an even brighter view.
Fully Multi-Coated: The brightest and most expensive option, where all surfaces are treated with multiple layers for optimum light transmission.
Lens Coating: Coatings reduce the reflection internally and externally, which increases the amount of light that reaches the eye.
Light Transmission: The size of the objective lenses determines the amount of light that reaches the eye. The larger the objective lenses, the greater the brightness and sharpness of the image seen through the binocular.
Magnification: Magnification is indicated by the first number given, e.g. 7x. The 7x means that you will see an object seven times closer than if you were viewing with the naked eye.
Multi-Coated: This means that the manufacturer applied multiple coats of anti-reflective layers to most of the lens and prism surfaces.
Objective Lens Diameter: The objective lens diameter is indicated by the second number, e.g. 35mm. This number indicates how much light is able to enter the binocular. The larger this number is the better your sight will be in lower light conditions.
Porro Prisms: This design has been a proven performer for over 100 years. The distinctive, off-set binocular housings accommodate two internal porro prisms which are used to elongate the light path to enable higher magnifications than primitive field or "opera" glasses. Porro prism binoculars typically deliver exceptionally high optical quality at more affordable prices than roof prism binoculars of the same power rating.
Resolution: Resolution is a measurement of the binocular's ability to distinguish fine detail. Better resolution also provides more intense color. Resolution varies directly with the size of the objective lens. All else being equal, a larger objective lens will always deliver more detail than a smaller one regardless of the magnification. Actual resolution hinges on a variety of factors: the quality of the optical components, light transmission through the binoculars, existing atmospheric conditions, optical and mechanical alignment (collimation) and visual acuity of the individual.
 Tasco Offshore Model OS19 Binocular
Don't ship out without "Offshore" - these binoculars meet the needs of all water enthusiasts. 7x manification and large 50mm objective lenses make the "Offshore" binoculars the perfect optics for all marine use. Dry nitrogen charged and sealed with o-rings, they are completely waterproof in salt and fresh water. Offshore's ergonomically designed body houses highly engineered optics ideal for the unique demands of marine observation. BAK-4 prisms, 7x magnification and 50mm objective lenses provide easy viewing from boat to boat, boat to shore, and even for landlubbers. Introducing the new "Offshore" 19 - completely redesigned for a variety of applications. These full-size waterproof binoculars feature BAK-4 prisms and large objective lenses for superior views. The rubber-armoured body features a new wave design to ensure easy gripping and to provide you with a sleek new ship-shape look. Optional extra : Floating / Comfort Strap : It's not unusual for things to slip from a heeling sailboat. Or to accidentally drop something overboard when in dock or out fishing. And how quickly things disappear in the deep six, when this happens, Tasco's floating neckstrap keeps them afloat untill they can be retrieved. A great boon to the boater. What if your not a boater, this strap is made for any and all long term observation. Ordinary binocular straps can become uncomfortable at football games, long hikes, all day excursions, but Tasco's floating / comfort strap can offer welcome relief.
Specification
- Power x Size : 7 x 50mm
- Field of view : 354ft @ 1000yds - 115m @ 1000m
- Focus system : Centre
- Prism type / glass : Porro / BAK-4
- Lens coating : fully multi-coated
- Finish : waterproof
- Exit pupil : 7.1mm
- Weight : 33oz
- Class : boating, wide angle
- Tripod adaptable : yes
- Accessories : carrying pouch & neckstrapt
 Bushnell Perma Focus 10 x 50 Model 17-5010
Bushnell PermaFocus 10x50 Binocular 175010 belong to well-known Busnell PermaFocus Binocular Series:
In a world that's complicated enough, the affordably priced PermaFocus binos are a relief for simple, fixed-focus, long-distance viewing. The wider field-of-view makes them ideal for spectator sports, distant wildlife observation or winter use with gloves. Thanks to quality fully-coated optics the action is bright and crisp and the ergonomic rubber housing means you won't drop them – even with gloves on.
Specifications of Bushnell PermaFocus 10 x 50 Binoculars 17-5010:
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Bushnell PermaFocus 10x50 Binocular 17-5010 |
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Power x Obj. |
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10x50 |
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Size Class |
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Standard |
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Focus System |
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Free |
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Prism System |
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Porro |
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Prism Class |
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BK-7 |
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Lens Coating |
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FC |
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FOV, ft.@1000yds. / m@1000m |
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393/131 |
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Close Focus, ft./m |
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- |
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Exit Pupil, mm |
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5.0 |
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Eye Relief |
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14 |
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Eyecups |
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Fold-Down |
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Weight, oz./g |
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31/879 |
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Water/Fog Proof |
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No |
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Adapt to Tripod |
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Yes |
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Features of Bushnell PermaFocus 10 x 50mm Binoculars 175010:
- Fully coated optics
for superior light transmission and brightness
- Unique "Focus-Free" feature stays in focus at most viewing distances
Non-slip rubber armor absorbs shock while providing a firm grip
Bushnell Permafocus 7x50 Binocular 175007 belongs to well-known Bushnell PermaFocus Binocular Series:
In a world that's complicated enough, the affordably priced PermaFocus binos are a relief for simple, fixed-focus, long-distance viewing. The wider field-of-view makes them ideal for spectator sports, distant wildlife observation or winter use with gloves. Thanks to quality fully-coated optics the action is bright and crisp and the ergonomic rubber housing means you won't drop them – even with gloves on.
Specifications of Bushnell Permafocus 7 x 50 Binoculars 17-5007:
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Bushnell Permafocus 7x50 Binocular 17-5007 |
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Power x Obj. |
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7x50 |
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Size Class |
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Standard |
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Focus System |
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Free |
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Prism System |
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Porro |
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Prism Class |
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BK-7 |
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Lens Coating |
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FC |
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FOV, ft.@1000yds. / m@1000m |
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372/124 |
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Close Focus, ft./m |
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- |
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Exit Pupil, mm |
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7.1 |
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Eye Relief |
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20 |
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Eyecups |
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Fold-Down |
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Weight, oz./g |
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27.2/771 |
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Water/Fog Proof |
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No |
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Adapt to Tripod |
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Yes |
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Features of Bushnell Permafocus 7 x 50mm Binoculars 175007:
- Fully coated optics
for superior light transmission and brightness
- Unique "Focus-Free" feature stays in focus at most viewing distances
Non-slip rubber armor absorbs shock while providing a firm grip
 Bushnell Falcon 10 x 50 InstaFocus Binocular
Bushnell Falcon 10x50 Porro Prism Binoculars 133450 belong to well-known Bushnell Falcon Binocular Series:
These value-priced, porro-prism binoculars make a magnified experience attainable for virtually anyone. Fully coated optics deliver bright, clear images, and rubber-armored housings make them tough and dependable.
Specifications of Bushnell Falcon 10 x 50 Porro Prism Binoculars 13-3450:
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Bushnell Falcon 10x50 Porro Prism Binocular 13-3450 |
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Power x Obj. |
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10x50 |
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Size Class |
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Standard |
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Focus System |
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InstaFocus |
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Prism System |
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Porro |
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Prism Class |
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BK-7 |
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Lens Coating |
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FC |
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FOV, ft.@1000yds. / m@1000m |
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300/100 |
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Close Focus, ft./m |
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25/7.6 |
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Exit Pupil, mm |
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5 |
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Eye Relief |
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9 |
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Eyecups |
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Fold Down |
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Weight, oz./g |
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27/765 |
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Water/Fog Proof |
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No |
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Adapt to Tripod |
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No |
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Features of Bushnell Falcon 10 x 50mm Porro Prism Binoculars 133450:
- Fully coated optics
for superior light transmission
- InstaFocus system
for fast focus on moving targets
Non-slip rubber grip pads for secure grip in all weather conditions
 Bushnell PowerView 7 x 50, 13-0750
Product Features and Technical Details
Product Features
- Ideal for stadium sports, outdoor, general use, hunting, and bird watching
- Fully coated lens
- Fold down eyecups
- Magnification: 7x zoom
- Objective lens: 50mm
Technical Details
- MODEL #: 13-0750
- MAGNIFICATION X OBJECTIVE LENS :
7x50
- FOCUS SYSTEM :
InstaFocus
- PRISM SYSTEM :
Porro
- FIELD OF VIEW ft@1000yds/m@1000m :
367/122
- EXIT PUPIL (mm) :
7.1
- WEIGHT (oz/g) :
26.5/750
- ADAPT FOR TRIPOD :
Yes
- GREAT FOR :
Stadium Sports, Outdoor/Nature, General Use/Vacation, Hunting, Bird Watching |
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