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Note!
The image will not be clear and sharp at first. You will adjust for clarity in the next step. You must first set
the binocular's interpupillary distance to fit your eyes. The setting for your eyes will be indicated on the
interpupillary scale (Fig. 1, 4). Remember this setting for faster resetting later.
Rubber eyecups
When wearing glasses, fold down eyecups to adjust the distance between the glasses and the eyepiece to
achieve the best observation effect.
Focusing
In order to get a clear image, you must focus the binoculars. This model has two individual diopter
adjustment rings on each telescope so you can adjust the optics to your individual eyes. You will need to
adjust each eyepiece.
When holding the binoculars in front of your your eyes and viewing at an object, close the left eye. Turn the
right diopter adjustment ring until the object image appears sharp and clear.
Then open your left eye and close your right eye. Turn the left diopter adjustment ring until the object
image appears sharp and clear in your left eye.
If you share your binoculars with another person, note the diopter index mark setting at the base of the
eyepieces first (Fig. 1, 3).
Then you can simply return the eyepieces to those settings when you next use the binoculars to view an
object at the same distance.
How to use the Mils Reticle to estimate distance
What is the View Angel
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.
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
by 2.
How to calculate the Horizontal View angle of an object
Where the object fits within the horizontal scale range(0~80 mils)inside the binocular, 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 20 so the horizontal
view angle is 20 mils.(10 on the scale = 10 mils, 20 = 20 mils etc).
How to calculate the Vertical View Angle of an object
Use the same method as above but use the vertical scale. In Fig. 5 the base of the light house meets the
vertical scale at zero and the top of the lighthouse meets the scale at 40 so the vertical view angle is 40
mils.
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