Levenhuk Army Binoculars with Reticle Guia Del Usuario página 4

Calculating the target's size using angle readings
When you know the distance to the target in kilometers, you can calculate its height and width in meters using the distance
measurement formula:
where H is the estimated height or width of the target in m, S is the distance to the target in km, and w is the vertical or horizontal
angle of the target in mil.
For example, the estimated distance to the tank shown in fig. 2 is 0.25km, the vertical angle is approximately 10mils, and the
horizontal angle is 20mils. Calculate the size using the formula:
Therefore, the tank's height is 2.5m, and the tank's width is 5m.
Using the additional reticle to calculate distance directly
If the target's height is known to be 2m, you can calculate the distance to it using the additional reticle on the bottom half of the lens
without using a formula. To do so, place the target on the horizontal line of the reticle. The point where the target touches the scale is
the distance in meters. For example, the distance to the tank shown in fig. 3 is 550m.
Specifications
Model
Magnification
Objective lens diameter
Field of view
Exit pupil diameter
Eye relief
Relative brightness
Twilight factor
Interpupillary distance
Close focus
Diopter adjustment
Fig. 2
Fig. 3
Army 8x40 Army 10x40
8x 10x
40mm
8° 6.3°
5mm 4mm
18.5mm 18mm
25 16
17.8 20
3m 4m
4
,
Army 7x50
7x
6.8°
7.1mm
23mm
50
18.7
56–73mm
5m
±4D
Army 10x50 Army 12x50
10x 12x
50mm
6.5° 5.3°
5mm 4.1mm
18mm 16mm
25 17
22.4 24.5
5m 6m