Transcript
6. How to measure an object’s size
5. How to use the Calculator Dial to estimate distance The calculator dial can be used to determine the distance quickly and easily without using the calculation above. The calculator dial comprises a rotational active ring showing a triangular “ANGLE” marking and a
According to the formula for distance measurement, you can calculate
Storage and maintenance Binoculars are precision optical instrument. I t should be carefully
the height using:
handled and maintained in order to keep it in good working conditions.
H = L × ω.
How to focus the binoculars
fixed scale marked “DISTANCE”. There are two scales in the active ring,
When measuring the size, you first estimate the distance to the object,
the upper scale is the view angle and the lower one is the size scale
and then measure the view angle. With these measurements, you can
marked “OBJECT SIZE”.
calculate the height of the target using that formula.
it back in its carrying case. After each use, b r u s h a n y d u s t o r d i r t off
For example:
from the lenses. After brushing, gently w i p e e a c h o f t h e l e n s e s w i t h
First, measure the view angle value of an object, rotate the active ring
1. Lenses: Always clean the lenses after each use and before you put
and place this value at the angle index mark. Then, find the division
The distance is 0.6km between the observer and the object. The
the special optical cloth. Never use your finger to wipe t h e l e n s e s, as
indicating the size of the object. It indicate a point at the fixed scale, look
Horizontal view angle is 60 mils and the vertical view angle is 30 mils.
body oil will get on the lenses and damage them. Never use anything
at the fixed scale, the distance is shown at that point on the fixed scale.
Using the formula you can get:
For example: (See Fig 7).You observe a lighthouse and its vertical view angle is 60 mils. Rotate the active ring and place the division marked “6” in the view scale at the angle index mark. Its height is 12m, the division marked “12” in the size scale lines up with the division marked “200” in the fixed scale. This tells u s t h a t t h e l i g h t h o u s e ’ s distance is 200m from us.
to wipe your lenses except special optical cloths. A l w a y s k e e p y o u r
The height: H = 0.6 ? 30 = 18m
optical cloth in the binoculars case for cleaning purpose.
The width: W=0.6 ? 60 = 36m
2. Although the eyepieces are made to turn for individual eye diopter adjustments, please d o n o t t u r n t h e m b e y o n d the factory stop set.
Tripod Mounting
Forcing it beyond this point will damage the eyepiece optics and make
A threaded socket for a tripod attachment is located at the base of the binoculars hinge (Fig. 8). Insert a binoculars tripod adapter, and attach
When the size of the observed object is outside the scale, you can just
your tripod screw to the base of the adapter.
the binoculars unworkable.
4. Avoid any extreme shaking or dropping of the binoculars.This may
within the scale and then divide the view angle by the same number. As the values are on a fixed scale ratio the resulting value on the dial will
damage the internal optics and prisms. Store the binocular in a dry and
be correct. (There is no need to multiply out the result).
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ANGLE 1.6
2
6 7 8 9 0
140
2.5 10 200
4
3 12
20 300
5
6
OBJECT SIZE 400
FORBUILT-INRETICLE
3. After using binoculars each time, always remember to turn the diopter adjustment to its “0” position to avoid damaging the ocular system.
divide the size of the object by a number that will bring your object size
1.2
WARNING Viewing the sun can cause permanent eye damage. Do not view the sun with your binoculars or with naked eyes.
600
DISTANCE
(fig.8) (fig.7)
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3. Reticle Scale (See Fig. 3)
General Overview Main Character This binocular is a floating model with an illuminated compass. It has two ranging tools. The eyepiece mils reticle and the Calculator Dial can be used to measure your distance from an object if its size is known, or
Note: the image will not be clear. You need to adjust for clearity in the next
There are vertical and horizontal lines on the reticle (3). Each small
step. You must first set the binocular’s interpupillary distance to fit with
division on both vertical and horizontal lines represents 5 mils and each
your eyes. The setting for your eyes will be indicated on the interpupillary
big division represents 10 mils (one perigon=6400 mils).
scale (Fig.2, 5). This scale setting can be used for later quicker resetting.
vice versa. The excellent optics allows clear transmissions of light and
The binoculars consist of two identical telescopes: a right side and a left
gives users a sharp and bright image of the view. It is suitable for multiple
side. Each half consists of (1) Eyepiece (2) Main Body (3) Object Barrel
purposes: viewing, boating or navigation etc.
(4) Body Hinge (5) Interpupillary scale (56 mm to 72 mm) (6) Diopter adjustment rings with diopter index marks. Each graduation represents
Construction Specifications
one diopter. (7) Rubber fold-down eyecups (8) Calculator Dial (9) Object
Optical system
lens dustproof cover (10) Eyepieces dustproof cover.
Basic binoculars optical construction, as shown in figure 1, consist
4
compass projective system(Built in the right half the binoculars).
5
7 6 2
3 9
8 9 10
(fig.2)
(fig.1) 2. How Binoculars work The light from the object or target you are looking at enters the binoculars
How to use the binoculars
through the Objective lens system (item 1, Fig. 1). When rays go through
How to focus the binoculars
the objective lens, they are converted to an upside down image. Then
1. Interpupillary adjustment
the rays pass through the prism system which reverses the upside down
the top of the lighthouse meets the vertical scale at 6 so the vertical view 7 6 5 4 3 2 1
The long eye relief eyecups allow the eyeglass wearer to see normal down easily for users with glasses. 4 3 2 1
angle is 60 mils. 4. How to use the mil reticle to measure distance The distance measurement of an object can be calculated by using the mil reticle (Fig 6). To use the calculator dial see section 3.2.5. The formula of distance measurement is L ( km)=H (m)/ω(mils)
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In order to get a clear image, you must focus the binoculars. This model
(fig.3)
Firstly, adjust the binoculars so that each eyepiece is adjusted to the
image and erects the image at the reticle (item 3, Fig.), which is the image
distance between your eyes. This can be done by holding the binoculars
that we see. This image is magnified by eyepieces (item 4, Fig. 1), so that
with both hands and bending the two body parts of the binoculars until
the observer can now see the distant object.
you can see a single circular image.
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)
has two individual diopter adjustment rings on each side so you can adjust
ω— the view angle of the object measured using the mils reticle on the
the optics to suit your individual eye. After placing the binoculars in front
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of (1) Objective Lens, (2) Porro Prisms (3) Reticle (4) Ocular Lens (5)
Use the same method as outlined in 4.2.2 but use the vertical scale.
images without taking off glasses. Light press on the eyecups to fold them 3. Focusing
3. How to measure the vertical view angle In (Fig. 5) the base of the lighthouse meets the vertical scale at zero and
2. Rubber fold-down eyecups
Outside Structure (Fig. 2)
1. Basic binoculars construction
A mil’s reticle (Fig.3) that has horizontal or vertical scale can measure the view angle of an object.
of your eyes and see through it, close your left eye. Then, rotate the right
2. How to measure the horizontal view angle
diopter adjustment ring until the object image appears sharp and clear in
2A. When the object fits within the horizontal scale range (-40~+40 mils)
your right eye. After that, open your left eye and close your right eye.
inside the binoculars, line one edge of the object up with a point on the
Rotate the left diopter adjustment ring until the object image appears sharp
horizontal scale line and read the value from where the other edge meets
and clear in your left eye.
the horizontal scale. As shown in (Fig 4), the right edge of the sail boat is
To focus on other objects, simply repeat the same steps.
at 2 and the left edge at 2 so the horizontal view angle is 40mils. (1 on the
If you share your binoculars with another person, record the diopter
scale = 10mils, 2= 20mils etc).
binoculars (see Fig. 3.2.2 and 3.2.3). When measuring the distance, first estimate the height of the object, then take the view angle reading on the binoculars and enter both into the formula. For example: A lighthouse is 18m. (H = 18m) The view angle on the binoculars is 60 mils (see Fig. 6)
mark index first (SEE 6). Then you can simply return the eyepieces to
Using the formula L(km) = H(m)/w(mils) we can estimate the distance.
those settings when next time you use the binoculars to view an object at
L = H/ω=18/60 = 0.3km = 300m 7 6 5 4 3 2 1
the same distance.
How to use the mils reticle and calculator dial to estimate distance 1. What is the View Angle? The view angle of an object is the angle from your binoculars to the edges of the object. It is calculated in mils using the mils reticle on your binoculars. Using the measurement you can calculate the distance to an object where the height or width of that object is known. This measurement is taken either horizontally or vertically and known as horizontal view angle or vertical view angle.
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Therefore, the distance between the observer and the lighthouse is 300m. 7 6 5 4 3 2 1
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(fig.4) 4 3 2 1
7 6 5 4 3 2 1 4 3 2 1
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2B. When the object is larger than the horizontal scale range (-40~+40 mils), choose a midpoint, take the view angle of this point and multiply by 2.
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H
ω L
(fig.5)
(fig.6)
