Celestron Oceana 71189-B User manual

Adjusting the interpupillAry distAnce (ipd)
Since the distance between the eyes (specifically, the distance between the
centers of the pupils) varies among individuals, the two eyepieces of the
binoculars must be correctly aligned (adjusted). This is called adjusting the
interpupillary distance. To adjust this distance, lift the binoculars up to your eyes
(using both hands) and look through them at an object in the distance. Move
the two halves of the binoculars about the hinge until you see one clear circle of
image through both eyes.
IPD Scale
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Adjusting Focus
This binocular has an individual focus system which requires that you focus each
eyepiece for the clearest and sharpest views. Start by selecting an object to look
at – (1) Close your right eye and rotate the left diopter until the object appears
sharp and clear; (2) Open your right eye and close your left eye and rotate the
right diopter until the object appears sharp and clear; (3) With both eyes open
the object should be sharp and clear; (4) Focusing on other objects requires that
you follow the steps above; (5) To return to the original object, note the diopter
adjustment scale settings so you can quickly obtain the best focus position.
Hint: Eyeglasses worn for nearsightedness should be worn when using binoculars
as you may not be able to reach a sharp focus at infinity without them.
set the rubber eyecups
Keep the Rubber Eyecups up if you do not wear eyeglasses but fold them down
if you do wear eyeglasses to obtain the maximum field of view.
pArts oF the binoculAr
instAlling the bAtteries – two lr1142
(or equivAlent) button cell
The batteries included with your binocular are for illuminating the compass,
so you can see it easily in the dark. You need to install the batteries which are
located in the case pocket. Unscrew the battery cap by hand and then remove
the screw with a coin or screwdriver. The batteries are to be installed with the
positive (+) side facing up towards you. Replace the screw and battery cap. If
you will not be using the binocular for a long period of time (a few months or
more), you should take the batteries out to preserve their life.
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using the reticle As AMeAsuring device
View Angle
View Angle of an object is the angle between the rays
from the binocular to its edges. Usually, this angle is
measured at the horizontal or vertical direction, and
defined as Horizontal View Angle and Vertical
View Angle.
A mil’s reticle (shown to the right) that has a horizontal
and vertical scale can measure the viewing angle of
an object. The Celestron binocular uses 10 mils for each
number (1,2,3,… as shown here).
MeAsuring the horizontAl View Angle
When the Horizontal View Angle is smaller than the horizontal
scale range (-40~+40 mils) inside the binocular, aim one
edge of the object at a horizontal scale line (the center or
the outmost line is selected according to the image size
of the object usually) and read its value. Then read the
value of the scale at which another edge was located.
Add these two values and this is the measured Horizontal
View Angle. The Horizontal View Angle of the target
(sailboat) is 2 decade mils (20 mils), and the Horizontal View
Angle between the targets is 4 decade mils (40 mils).
When the Horizontal View Angle is larger than the horizontal scale range
(-40~+40 mils), use vertical line splits (for example: mast, sail, etc.) on the object
can be selected to make the necessary estimated measurements in a step by
step fashion.
MeAsuring the VerticAl View Angle
Vertical View Angle measurement is similar to measuring
the Horizontal View Angle. When the Vertical View
Angle measurement is small, aim the intersecting point
of the vertical and horizontal lines of the reticle at
the lower part of the object and read the scale value
at the top of the object. The angle included between
the upper and lower parts of the target (lighthouse) is 6
decade mils (60 mils).
When the Vertical View Angle is larger than the vertical scale range (80 mils), it
can be measured in steps, and the angle can be obtained by summing up the
value of each step.
using the reticle to MeAsure DistAnce
The distance measurement of a target can be calculated by using the mil reticle.
The formula of distance measurement: L(km) = H (m)/ω
L — the distance between the observer and the object (km)
H — the height of the object (m)
ω — the View Angle of the object measured with the reticle
of the binocular (mil).
oceAnA 7x50 binoculAr Model # 71189-b
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1. Eyepieces
2. Main Body
3. Objective Lenses
4. Body Shaft
5. IPD Scale
6. Tripod Adapter Threads
7. Rubber Eyecups
8. Compass Window
9. Button for Compass
Illuminator
10. Battery Compartment
11. Objective Lens Caps
12. Eyepiece Protective Cap
13. Diopter Adjustment Ring
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ENGLISH

When measuring the distance, estimate the width or height of the object and
next measure the View Angle of the object. Accordingly, you can calculate the
distance between the observer and the object using the formula.
For example:
There is an adult whose height is 1.70 m. (H = 1.70 m)
The Vertical View Angle of the adult is 4 decade mils (40 mils)
L = H/ω = 1.7/40 = 0.0425 km = 42.5 m
Therefore: the distance between the observer and the adult is 42.5 m.
(for feet conversion, multiply 42.5 by 3.28).
using the cAlculAtor diAl As AMeAsuring device
The Calculator Dial can be used to determine distance quickly and easily without
calculation. The Calculator Dial includes a triangular Angle Index Mark marked
“ANGLE”, a rotational Active Ring and a Fixed Scale marked “DISTANCE”.
There are two scales in the Active Ring, one is for View Angle and the other is
Size marked “OBJECT SIZE”.
First, measure the View Angle value of an object, and rotate the Active Ring and
place this value at the Angle Index Mark. Then, find the division indicating the
size of the object (see formula below), it indicates a point at the Fixed Scale.
Look at the Fixed Scale, the distance is shown at that point on the Fixed Scale.
For example: You observe a lighthouse, and its measured Vertical View Angle is
6 decade mils. You need to rotate the Active Ring and place the division marked
“6” in the View Scale at the Angle Index Mark. Its assuming height is 12 m, the
division marked “12” in the Size Scale points to the division marked “200” in the
Fixed Scale. This tells us that the lighthouse’s distance is 200 m from us.
The Size Scale and Fixed scale of the Calculator Dial are in a “ratio” to each
other. When your observing object is too large or too small, you can zoom
it tenfold or discretionarily, and zoom the measuring result in the same way.
Thus, you can get more convenience, especially when you aren’t familiar with
diversified units.
how to MeAsure An objects size
(height And width)
According to the formula for distance measurement, you can calculate the
height using:
H = L × ω. (Height = Distance x View Angle)
When measuring the size, you first estimate the distance to the object and
then measure the View Angle. With these measurements, you can calculate the
height of the target using the formula.
For example:
The distance is 0.6km between the observer and the object. You can measure
that the Horizontal View Angle is 6 decade mils (60 mils) and the Vertical View
Angle is 3 decade mils (30 mils). So, using the formula you can get:
The height: H = 0.6 × 30 = 18 m (for feet divide 18 by 3.28)
The width: H = 0.6 × 60 = 36 m
using the coMpAss
The Compass is aligned with the vertical range finding scale. The Compass by
itself will only indicate direction to or from an object but not relative position. To
determine position, you need a map or chart and a protractor.
The azimuth angle can be measured through the analog Compass which is built
into the binocular. It shows the azimuth of the object
relative to the observer. Each graduation of the
Compass equals one degree of angle. When the
object lies north from you, the Compass reads
360°. The Compass degrees will increase
when you turn it clockwise. 90° means the
object lies in the east from you, 180° means
the south and 270° means the west.
In order to insure precise angle measurements,
the binocular should be kept horizontal and level when
reading the compass, and the object should lie in the middle of the reticle.
Note: When using the Compass, always keep in mind the local variation
between magnetic north (the Compass reading) and true north. Do not put
your finger or hand over the white button (compass window), as it allows light
to enter the binocular, so the Compass readings can be seen.
AttAching your binoculArs to Atripod
These binoculars feature a built-in tripod adapter fitting which is a threaded
screw hole underneath a cap. To attach an optional binocular tripod adapter,
remove the cap and then thread the screw from the binocular tripod adapter
into the threaded screw hole. The other end of the binocular tripod adapter
attaches to a photographic tripod. Mounting binoculars this way allows for
added stability and comfort.
CARE AND CLEANING: Binoculars do not need routine maintenance other
than making sure that the objective lenses and eyepieces are kept clean. If
repairs become necessary, they should be serviced by the manufacturer or
a qualified binocular repair company. If your binocular is roughly handled or
dropped, there is a good chance that the collimation (alignment of the optics)
will be out and they should be serviced. Dirty objective lenses and/or eyepieces
mean less light transmission and loss of brightness, as well as unsharp images.
Keep your optics clean! When not using your binocular, store it in the soft case
provided after putting the lens caps on. Avoid touching the glass surfaces,
however, if fingerprints (which contain mild acid) do get on the glass, they
should be cleaned as soon as possible to avoid damaging the coatings. To clean
the optical surfaces, we recommend a lens/optics cleaning kit available at most
photo or optical shops. Follow the instructions provided with the kit closely. If
you have a lot of dust or dirt accumulated, brush it off gently with a camel’s
hair brush and/or utilize a can of pressurized air before using the cleaning kit.
Alternately, you could use the Celestron LensPen (# 93575) made especially for
cleaning binoculars. Never attempt to clean your binocular internally or try to
take it apart!
CAUTION! Viewing the Sun may cause permanent eye damage. Do not view
the Sun with your binocular!
PROBLEMS OR REPAIR: If warranty problems arise or repairs are necessary,
contact the Celestron technical support department.
2835 Columbia Street • Torrance, CA 90503 U.S.A. • Tel: [phone]
©2012 Celestron • All rights reserved. • Printed in China • 03-12
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