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Details about  2 BINOCULARS *CELESTRON*10x50mm WIDE ANGLE+TASCO 4 x 30

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Item Sold
Item condition:
May 21, 2012
US $47.95
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Item location:
WISCONSIN, United States


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Last updated on  Mar 05, 2012 11:15:47 PST  View all revisions

Item specifics

New: A brand-new, unused, unopened, undamaged item in its original packaging (where packaging is ... Read moreabout the condition

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* Their wonderful "No Fault" warranty coverage assures that your binoculars will be repaired or replaced at Celestron's option for as long as you own them-no questions asked!


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Celestron 10x50 UpClose *Wide Angle* Porro Prism Binocular-71137 with 7.0-Degree Angle of View:

The UpClose Series from Celestron is a complete line of compact and full size binoculars at very economical prices. Celestron 10 X 50 UpClose Binocular is rubber covered to protect against rough handling. 10x50mm Up Close Binocular #71137 is fully coated to give high contrast views.

Celestron 10X 50 mm UpClose Binocular - 71137 belongs to Porro Prism Series and therefore has fully coated optics and diopter adjustment for fine focusing.

Celestron UpClose Series has something for everyone whether for action sports, vacationing, nature viewing, wildlife observing or various other activities.


Prism Type:          Porro
Magnification:           10x
Objective Diameter:          50mm
Angle of View:          7.0
Field-of-View:          (@ 1000 Yds) 368' (122 m at 1000 m)
Minimum Focus Distance:          24.0' (7.3 m)
Exit Pupil Diameter:          5.0mm
Eye Relief:          11mm
Relative Brightness:          25.0
Twilight Factor:          26.5
Focus Type:          Center
Weatherproofing:          Water resistant
Tripod Socket:          Yes
Dimensions(WxHxD):          4.8 x 4.1 x 2.1" (122 x 104 x 54mm)
Weight:          1.75 lb (795 g)

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Features of Celestron UpClose10x50 Binocular:

    * Fully coated lenses
    * Bk7 Porro prisms
    * Peel-down eyecups
    * Tripod adaptable

Wide Angle Binoculars

What is the Angle of View?

It is easier to start with the field of view (FOV) of a pair of binoculars, which is a measurement that indicates the width of the view you see through the binoculars at a specified distance, it is most often represented in feet at 1,000 yards, but increasingly common is in meters at 1,000 meters.

The angle of view (AOV) which is also known as the Real field of view is the angle expressed in degrees between the left and right extremes of the FOV and the center of the objective lenses of your binocular (sounds complicated, but take a look at the diagram below). So in the example represented in the diagram below, the field of view of theses binoculars is 315 feet at 1,000 yards and the angle is 6°

Field of View and Angle of Binoculars

Apparent field of view (AFOV)
Some binocular manufacturers list their field of view as the Apparent field of view, this is the value of the real field of view multiplied by the magnification of the binoculars (Apparent field of view = Magnification x Real field of view). This value is important because it is comparable even among binoculars of different magnifications.

On top of this there is something known as the Apparent field of view ISO 14132-1:2002 standard, that some manufacturers are adopting, the formula is fairly complicated, so for simplicity I will stick with the "standard" Apparent field of view in this article.

What are Wide Angle Binocular Binoculars Best for?

A binocular with a wide field of view eyepiece will often have reduced eye relief and a wider field of view also usually means a less powerful magnification. So in general, the higher the magnification, the smaller your angle of view, there is always a compromise and so you need to decide how you will mostly be using your binoculars for and get your ideal setup.

Binoculars with a wide field of view (Wide Angle Binoculars) basically "fit" more into the image that you see when looking through them, this makes finding objects, especially moving ones that much easier. That is why the best bird watching binoculars tend to have lower magnifications and higher FOV's especially in wooded areas. Obviously if your main birding is done out in open areas like at the sea or on lakes and dams, then a higher magnification may be preferable over a wide field of view.


Tasco Essential Series 4 x 30mm Compact Binocular

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Tasco Essentials 4x30 Compact Binocular 25430BK and 25430BK D are low-magnification binocular from Tasco with a large and comfortable exit pupil. This Tasco Binocular is inexpensive. Tasco Essential Binocular is an ideal choice for wide angle/low magnification situations such as for use upon a moving platform or at the theater. Tasco Essentials 4x30 Compact Binocular is roof-prism and center-focus binocular.

It's the little mysteries in life that we find most enriching, and often it's the details that tell the story. The bottom line is, you don't have to be searching for an ivory-billed woodpecker to justify owning a pair of compact, high-performing binoculars. The Essentials line of binoculars from Tasco are tough, weather resistant and, most importantly, affordable. So whether you're big-game hunting or stopping off to see the world's largest prairie dog colony, there's an Essentials binocular just right for the occasion.

Available Tasco Compact 4X30 mm Binoculars packs:

    * 25430BK: Tasco Essential Series Binocular 4X 30mm, paper box
    * 25430BKD: Tasco 4x 30mm Essential Compact Binocular, plastic clam pack

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Prism Type:     Roof
Magnification:     4x
Objective Lens Diameter:     30mm
Angle of View:     12.4
Field-of-View (@ 1000 Yds):     650' (216 m @ 1000 m)
Minimum Focus Distance:     20' (6.1 m)
Exit Pupil Diameter:     7.5mm
Eye Relief:     15mm
Relative Brightness:     56.3
Twilight Factor:     10.9
Focus Type:     Center
Weatherproofing:     Water resistant
Tripod Socket:     No
Dimensions:     4.4 x 3.5 x 1.6" (111 x 90 x 40mm) WxHxD
Weight:     0.47 lb (215g)

Features of Tasco 4 x30mm Compact Binocular from Essentials Series:

    * BK7 Prisms
    * Center focus dial
    * Two-tone design

Package Contents:

    * Tasco Essentials 4x30mm Compact Binocular, Black 25430BK or 25430BK-D
    * Case
    * Strap


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