- 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
Close Focusing Distance
Field of View @ 1000m/yds
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
What is View Angle
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
How to calculate the Horizontal View Angle of an object
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).
How to calculate View Angle when the object is larger than the scale
the object is larger than the scale, choose a midpoint, take the view angle of
this point and multiply by2.
How to calculate the Vertical View Angle of an object
the same method as outlined in section 2 but use the vertical scale.
How to use your binoculars to estimate distance
section shows you how to calculate the distance manually. To use the calculator
dial skip to section 5)
formula for measuring distance is L (km) =H (m)/w (mils)
the distance between the observer and the object in km
the height of object in m (this must be a known value)
the view angle of the object measured using the mils reticle on your binoculars
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.
light house is 12m (H=12m)
view angle on the binoculars is 60 mils
the formula L (km) =H (m)/w (mils) we can estimate the distance.
the distance between the observer and the lighthouse is 200m.
How to use the calculator on your binoculars to estimate distance
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”.
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.
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).
How to measure an object’s size (height and width)
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.
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
height H= 0.6x30=18m
width W= 0.6 x 60=36m
to use the compass
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.
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.