Bresser 1866840 Instruction Manual - Page 6

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How to use your binoculars to estimate distance

The formula for measuring distance is L(km)=H(m)/w(mils)

Where:

L=the distance between the observer and the object in km

H=the height of the object in m(this must be a known value)

W=the view angle of the object measured using the mils reticle on your binoculars

When measuring the distance, first estimate the height of the object, then take the view angle reading on

your binoculars and enter both the formula.

For example:

A light house is 12m. (H=12m)

The view angle on the binoculars is 40 mils (see fig.5)

Using the formula L (km) =H (m)/w (mils) we can estimate the distance.

L=12/40=0.3km (300m)

Therefore, the distance between the observer and the lighthouse is 300m.

How to use the compass

The azimuth angle can be measured through the compass built into the right half of the body. It shows the

azimuth of the object relative to the observer.

Each graduation of the compass equals one degree. When the object lies to the north, the compass shows

360° (degrees). And it will increase when you turn clockwise. 90°means the object is located to the east,

180°means south and 270°means west.

In order to ensure precise angle measurements, the binoculars should be kept horizontal and level when

reading the compass. The object should be in the middle of the reticle.

Under the condition of night or darkness, the figures of the compass and the reticle need to be illuminated

by pressing the on/off button.

Changing the batteries

The batteries for the compass will be exhausted if the internal lighting system has been used for long

periods.Batteries can also become weak if not used for an extended period of time. If the light becomes

dim, open the battery cover and replace with fresh batteries.

Batteries are included and uninstalled in your binoculars, which is put in the bag, you need to install it

first before you use. When it becomes necessary to replace them, unscrew the battery cover with a coin

or screwdriver and replace with the same type. Be sure to install the batteries in the same direction as

the originals, with the flat positive (+) side facing up towards the cover on the battery. Screw the battery

cover back on tightly and press the illuminator button to test the light. The figures should be visible on the

compass location( you may need to cover the right objective lens if you are outside in bright light).

Note!

The battery (type AG9/LR936) should be replaced at the same time. The battery should be taken out if the

binoculars will not be used for a long time. Batteries left in the binoculars for extended periods of time

without being used may leak and cause damage to the binoculars.

Storage and maintenance

Binoculars are a precision optical instrument. They should be carefully handled and maintained in order to

keep them in good working order.