Newcon Optik NC 3-12X50 - Manual (Page 17)

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L= (H х 1000) / h,
where L – distance to the target, m;
H – real length (or height) of the target, m;
h – number of the segments of the reticle that
cover the chosen dimension of the target.
Figure 3
(see also TABLE 6)
The Figure 3 shows an example of distance
estimation to a boar, which is 1.5 meters in length.
Also, it is possible to determine distances to targets
with size of the target being from 30 cm to 2 m using
Tables 5 and 6.