Armasight DAB10X42RF0ARM1 10x42 Binoculars - Manual (Page 12)

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The 10x42 reticle has horizontal scale and vertical scale (see Figure 9). Vertical and horizontal lines on
the reticule is in mils as unit. Reticle uses measurements down to .5 milirad similar to Leopold’s Sniper
Scope. You can obtain the azimuth angle, upper and lower angle, distance and height or width etc. by
using this reticle.
3.3.2. HOW TO USE THE RETICLE AND CALCULATOR DIAL
NOTE:
The 7x50 reticle is used for example.
1) How to Measure the Horizontal View Angle
The azimuth angles is the angle included between two objects to be measured at the horizontal direc-
tion of the binoculars.
A. When the Horizontal View Angle is smaller than the horizontal scale range (-50~+50 mils) inside
the binoculars, aim one edge of the object at a horizontal scale line(the center or the outmost line are
selected according to the image size of object usually) and read its value. Then read the value of the
scale at which another edge was located. Plus this two value, the sum value is the measured Horizontal
View Angle. As shown in Figure 10, the Horizontal View Angle of the target (tank) is 20-00 mils, and the
Horizontal View Angle is 20 mils.
B. When the Horizontal View Angle is bigger than the horizontal scale range (-50~+50 mils), an vertical
line splits(for example: mast, chimney etc.) on the object can be selected to make the necessary esti-
mated measurements in a step by step fashion. The sum of the value from each step is used to obtain
the measured value. As shown in Figure 11, the azimuth of target (cruiser) is 130 mils (60+70=130).
Figure 10. Horizontal View Angle Measuring
10 mils
5 mils
1 mil
.5 mil
Figure 9. 10x42 Reticle