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Specifications:
- Magnification: 8X
- Objective Diameter: 42mm
- Field of View: 367 ft @ 1000 yds
- Field of Angle: 7.0°
- Eye Relief: 5.3mm
- Near Focus: 2.0m
Features
- Finding out a practical binocular to meet your specific demand is not a hard thing when you get our waterproof binocular
- The large center focus ensures fast yet precise image adjustments
- No matter you go camping, climbing mountains or observe the space, the 8X binoculars will bring the distant view under your eyes
- The Long eye relief take use of innovative twist-and-lock eyecups to give you comfortable viewing, even for eyeglass sunglass wearers
- The Waterproof binocular is also nitrogen-purged making them fully submersible with no internal fogging
- The binocular is light weighted with ergonomic design so that it is easy to hold and wear
- The black binoculars, not only beautiful but also practical would be your nice choice
- With a nice binocular telescope, you can dig out more fun in life
Details:
- The appearance of this black binocular shows outstanding taste and it can be one of your proud possessions
- You can adjust the focus by rotating the hand wheel in the middle in order to get your ideal view
- There are covers to give your lens good protection without scratching the lens of the 8X binocular
- We also offer you one portable bag for you to take this waterproof binocular easily and safely
- Another thoughtful design of this binocular is the shields for the eyepieces
- Next time when you go camping or traveling, you can take the complete set of our waterproof binocular
- Holding binocular in your hands, you can see not only the far-away scenery, but also a wonderful feeling of transcending horizon
How to Understand Binocular Magnification
Binoculars consist of a pair of telescopes that are mounted next to each other. Each eye uses one of the telescopes to view an image that is not only magnified but also gives the appearance of depth when the lenses are properly aligned. The exact magnification that a binocular provides may be calculated from the focal length of the objective lens and eyepiece. However, in practice, the magnification relies almost exclusively on the diameter of the objective lens- Define magnification. This is the ratio of the apparent size of an object to its actual size and is therefore a pure number without units. A hand-held pair of binoculars typically has a magnification of 7 to 12. Higher magnifications are technically possible but require the binoculars to be mounted securely
- Measure the objective lens. This is the lens at the front of the binoculars that gathers the light and affects the potential magnification of the binoculars. The objective lens on a pair of binoculars is typically about 50 mm in diameter
- Calculate the focal length of the lens. This depends on the physical properties of the lens, but it is typically at least 4 times the width of the lens. The focal length of the lens for a pair of binoculars is therefore 200 to 250 mm
- Obtain the focal length of the eyepiece. The diameter of the eyepiece should be about the diameter of a fully dilated human pupil, about 7 mm. The focal length of the eyepiece is therefore about 25 mm
- Calculate the magnification of the binoculars. This can be given as MA = fo/fe where "fo" is the focal length of the objective lens and "fe" is focal length of the eyepiece. This shows that MA = 200/25 = 8 for most binoculars. Note that the magnification of a pair of binoculars generally relates directly to the size of the objective lens, since the size of the eyepiece is more or less fixed to the diameter of a fully dilated pupil
Package Included:
- 1 x Waterproof Binocular
- 1 x Bag
- 1 x Shoulder Strap
- 1 x Cleaning Cloth
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Carr
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Bought this item on
12-16-2009- Other Thoughts: 8X binocular is enough for my use and the magnification is very clear.
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Jason
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Bought this item on
11-08-2011- Other Thoughts: I use this binocular to watch the park under my building, the image is clear enough. So I am satisfied with my choice.
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Eric
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Bought this item on
11-06-2011- Other Thoughts: good view and easy to take along
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Jenny
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Bought this item on
03-09-2010- Other Thoughts: My brother always wants to get one binocular and I bought this black binoculars to him after I got the first salary. Hope he likes it.
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Gene
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Bought this item on
06-08-2011- Other Thoughts: As a new hand of binoculars, I think I need some time to get to know how it works. Anyway, it looks nice.
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