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Basic binocular optical construction, as shown
in Figure 1, consist of (l)the objective lens, (2)
the erecting prisms, (3) the reticle and (4) the eye-
piece. The reticle (3) is build in the right system.
3.1.2 How a Binocular works
The light from the object or target you are
looking at enters the binocular through the Objec-
tive lens system (item 1, fig. 1). Due to the objec-
tive lens, the image at this point is upside down.
However, as the light rays of the image passes
through the prism system, ( known as the erec-
tive prisms) ( item 2, fig. 1) it becomes right side
up ( erect) and changed from right to left to left
to right so written words appear cor rect. (Until
this happen the word "word" looks like drow). At
this point the image rays are now passed through
the reticle lens (item 3, fig. 1). The image rays are
now passed through the lens assembly (item 4,
fig. 1) so that the observer can now see the distant
object.
3.1.3 Reticule (See Fig. 3)
There are vertical and horizontal lines on the
reticule 3. Each small division on both vertical
and horizontal lines represents 5 mils and each
big division represents 10 mils (one circularity
angle = 6400 mils. (One circular angle equals 1
degree of angle, equals 1 minute of angle, equals
60 seconds of angle, equals 6400 mils.)
4
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