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Details about  10x50 Waterproof Floating Marine Binoculars with Build-in Range Finder & Compass

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10x50 Waterproof Floating Marine Binoculars with Build-in Range Finder & Compass
Item Ended
Item condition:
27 Aug, 2012 02:54:50 BST
Doesn't post to United States | See details
Item location:
Hangzhou, zhejiang, China


eBay item number:
Seller assumes all responsibility for this listing.
Last updated on  23 Aug, 2012 02:30:05 BST  View all revisions

Item specifics

New: A brand-new, unused, unopened and undamaged item in original retail packaging (where packaging is ... Read moreabout the condition
Type: Binoculars
Weight: 32oz Max. Magnification: 10x
Application: General Purpose, Marine, Spectator Objective Lens Diameter: 50mm
Focus System: Individual Focus Lens Coating: Multi-coated
Eye Relief: 20mm Optical Design: Porro prism
Exit Pupil: 5mm Features: Waterproof
Field of View @ 1000yds: 396ft Dimensions: 7.9Lx3.1Wx5.9H

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EK8916 Green 10x50 Waterproof Floating Marine Binoculars with Build-in Range Finder & Compass






  • 10 x magnifications for steadiest imaging in rough sea conditions 
  • Build-in range-finding reticle and compass for military and marine use 
  • 100% waterproof and nitrogen purged for fog proof performance
  • Minimum internal light glare
  • High resolution crisp images
  • Dry Nitrogen in the body
  • Impact resistant
  • Rubber armoring is durable and offers great grip in wet weather
  • Ample eye relief and soft, fold-down eyecups
  • Individual focus system for viewing accuracy
  • Ease to use
  • Include carrying case, lens covers, neck strap, batteries and lens cleaning cloth
  • 5 years warranty

Product Summary 

Item No.


Lens Coating




Prism Type

Porro BaK-4


Lens Diameter


Focus System

Individual Focus

Eye Relief


Exit Pupil


Close Focusing Distance

2.5 m



Field of View @ 1000m/yds





5 Years




Carrying Case, Neck Strap,Batteries, Lens Cleaning Cloth and Lens Covers


    1x New EK8916 Green 10x50 Binoculars,  

    1x Carrying Case, Neck Strap,Batteries, Lens Cleaning Cloth and Lens Covers

    How to Use the Mils Reticle and Calculator Dial to Estimate Distance


    1. What is View Angle

    The view angle of an object is the angle from your binoculars to the edges of the object. It is calculated in mils using the Mils Reticle on your binoculars. Using this measurement you can calculate the distance to an object where the height or width of that object is known. This measurement is taken either horizontally or vertically and known as Horizontal View Angle or Vertical View Angle.


    2. How to calculate the Horizontal View Angle of an object

    Where the object fits within the horizontal scale range(-40+40mils) inside the binoculars, line one edge of the object up with a point on the horizontal scale line and read the value from where the other edge meets the horizontal scale. In fig.4 the right edge of the sail boat is at zero and the left edge at 2 so the horizontal view angle is 20 mils. (1 on the scale =10mils, 2=20mils etc).


    2.1. How to calculate View Angle when the object is larger than the scale

    When the object is larger than the scale, choose a midpoint, take the view angle of this point and multiply by2.


    3. How to calculate the Vertical View Angle of an object

    Use the same method as outlined in section 2 but use the vertical scale.


    4. How to use your binoculars to estimate distance

    (This section shows you how to calculate the distance manually. To use the calculator dial skip to section 5)

    The formula for measuring distance is L (km) =H (m)/w (mils)


    L= the distance between the observer and the object in km

    H= the height of object in m (this must be a known value)

    w= the view angle of the object measured using the mils reticle on your binoculars

    When measuring the distance, first estimate the height of the object, then take the view angle reading on your binoculars and enter both into the formula.

    For example

    A light house is 12m (H=12m)

    The view angle on the binoculars is 60 mils

    Using the formula L (km) =H (m)/w (mils) we can estimate the distance.

    L= 12/60=0.2km (200m)

    Therefore, the distance between the observer and the lighthouse is 200m.

    5. How to use the calculator on your binoculars to estimate distance

    The Calculator Dial can be used to determine the distance quickly and easily without using the above calculation. The Calculator Dial comprises a rotational active ring showing a triangular “ANGLE” marking and a fixed scale marked “DISTANCE”. There are two scales in the Active Ring, the upper scale is View Angle and the lower is a Size Scale marked “OBJECT SIZE”.

    First, measure the View Angle value of an object, rotate the Active Ring and place this value at the Angle Index Mark. Then, find the division marked “6” in the View Scale at the Angle Index Mark. Its height is 12m, the division marked “12” in the Size Scale lines up with the division marked “200” in the Fixed Scale. This tells us that the lighthouse’s distance is 200m from us.

    Where the size of the observed object is outside the scale just divide the size of the object by a number that will bring your object size to within the scale and divide the View Angle by the same number. As the values are on a fixed scale ratio the resulting value on the dial will be correct. (There is no need to multiply out the result).


    6. How to measure an object’s size (height and width)

    According to the formula for distance measurement, you can calculate the height using H= L x w. when measuring the size, you first estimate the distance to the object, then measure the View Angle. With these measurements, you can calculate the height of the target using the formula.

    For example

    The distance is 0.6km between the observer and the object. The Horizontal View Angle is 60 mils and the Vertical View Angle is 30mils. Using the formula you can get

    The height H= 0.6x30=18m

    The width W= 0.6 x 60=36m

    How to use the compass

    The azimuth angle can be measured though the compass built into the right half of the body. It shows the azimuth of the object relative to the observer. Each graduation of the compass equals one degree. When the object lies to the north, the compass shows 0(degrees). And it will increase when you turn clockwise.  90°means the object is located to the east, 180°means south and 270°means west.

    In order to ensure precise angle measurements, the binoculars should be kept horizontal and level when reading the compass. The object should be in the middle of the reticle.


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    1. We ship your orders within 1-2 business days after the payment cleared.

    2. The item is sent from China via “Expedited Shipping from outside” (DHL Express, the transit time is 5-7 working days), or "Economy Int'l Shipping" (the transit time is 25-30 business days). Buyers can contact us to choose the transportation and ask the freight. If you buy more items, pls contact us, we can give you the combined shipping discounts.

    It may have the import tax via DHL Express, so pls tell us the declared value you want us to write, and we are not responsible for any custom duty or import tax.

    3. If the item is not with you more than 7 working days (item is dispatched via DHL), or 30 working days (Economy Int'l Shipping), please contact us through the eBay ‘contact seller’ link.

    We will send the item to your PayPal address, so please make sure that your PayPal address matches the one you want us to send to. Please leave us your phone number in order to ensure the successful delivery.

      About Us

    1. We are an online retailer who specializes in a range of sport optics such as binoculars and spotting scopes. We are committed to providing our customers with an efficient and friendly online shopping experience.

    2. We appreciate your past and future business, and hope to see you shop online with us at outdoor-product. Our price may be not the lowest, but we are trying hard to offer you the best quality and service.

    3. I am here and ready to assist you with any questions or concerns you might have before or after the purchase. Thank you very much!

                        Bid with Confidence! 

    See what others have said about us and our service:

      Return/Replace Policy

    1. Five years Manufacturer's Warranty, Buy with confidence!

    2. If you are not satisfied when you receive your item, please return it within 30 days for a replacement or money back. Returned items must be in their original and unused condition, complete with all parts, accessories, and original packaging. Please contact us before you return it.

    3. Defective items MUST BE reported and returned to us within the warranty period (and in the original packaging, if possible). You must tell us what the defect is and give us your eBay ID.

    4. Return shipping is to be paid by the Buyer. We are not responsible for any custom duty or import tax.

    Questions and answers about this item

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