Coleman CDB804AZ3 Guía de inicio rápido
INTRODUCTION:
Please retain the packaging and instructions for further reference, as they contain important information.
CDB804AZ3
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Congratulations on your purchase of the precision crafted CDB804AZ3 COLEMAN
telescope. With the proper care and handling of your telescope, you will enjoy years of
viewing pleasure.
As an astronomical device, the CDB804AZ3 telescope has been designed for both a
beginner and advanced star gazer. It provides views of the moon and planets, as well as
dozens of galaxies, star clusters, and nebulae.
As a terrestrial (land) telescope, the CDB804AZ3 brings the world’s natural wonders
closer. It delivers superb scenic views and allows for observation of animals and
landscapes from a distance. To obtain the best performance from your telescope, please
carefully read this manual.
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Specifications, colors, packaging, and/or contents of this manual are subject to change without notice.
!
WARNING!
CHOKING HAZARD
Small parts. Not suitable for
children under 3 years.
PARTS LIST FOR CDB804AZ3 Telescope:
PARTS LIST
A. Dust Cap / Mask
(Remove before Viewing)
B. Dew Cap/ Sun Shade
C. Objective Lens
D. Telescope Optical Tube
E. Red Dot Finder Assembly
F. Alignment screws
G. Focusing Tube
H. Eyepieces (K10, K25), Eyepiece cases (2)
I. 45 Erecting Image Diagonal
J. Focusing Knob
1. Azimuth Flexible Control Cable
2. Altitude Flexible Control Cable
a. Accessory Tray
b. Tripod Leg
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I. ASSEMBLY:
1) Carefully remove all parts from the cardboard cartons and lay them on a table, floor or other
flat surface in order to take an inventory of all the pieces. Keep your box for storage or in
case you ever need to ship your telescope.
2) Tripod Set Up:
A. Adjusting the Tripod Legs (Fig.1)
1. Slowly loosen the height adjustment clamp and gently pull out the lower section of
each tripod leg. Tighten the screws to hold the legs in place (see Fig 1).
2. Spread the tripod legs apart to stand the tripod upright.
3.
Adjust the height of each tripod leg until the tripod head is properly leveled. Note that
the tripod legs may not be at same length when the AZ3 mount is level.
B. ATTACHING THE ACCESSORY TRAY (Fig. 2)
1. Align the accessory tray with the bracket, and secure from underneath (see Fig 2).
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3) Attaching the Telescope Main Body to the Tripod
Position the telescope main body (E) on top of the tripod head, aligning it to the fixing
screws. Connect the telescope optical tube to the tripod head and secure it in place by
tightening the fixing screws (see Figure 3). DO NOT OVERTIGHTEN.
4) AttachingtheRedDotFinder
Slide finderscope assembly/ red dot finder into the rectangular slot and
tighten the thumbscrew to hold the bracket in place (see Figure 4).
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5) Attaching the Diagonal and Eyepiece
A. Loosen the thumbscrew on the end of the focus tube.
B. Insert the diagonal into the focus tube and re-tighten the thumbscrew to hold the
diagonal in place.
C. Loosen the thumbscrews on the diagonal.
D. Insert the desired eyepiece into the diagonal and secure by re-tightening the
thumbscrews (see Figure 5).
6) Installing the Control Cables
Install cables for fine adjustments of Altitude and Azimuth as shown in Figures 6 and 7).
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II. OPERATING YOUR TELESCOPE:
1 ) Using the Red Dot Finder
The Red Dot Finder is a zero magnification pointing tool that uses a coated glass window to
super-impose the image of a small red dot onto the night sky. The Red Dot Finder is
equipped with a variable brightness control, azimuth adjustment control, and altitude
adjustment control. The Red Dot Finder is powered by a 3-volt lithium battery located
underneath at the front. To use the Finder, simply look through the sight tube and move
your telescope until the red dot merges with the object. Make sure to keep both eyes
open when sighting (see Figure 8).
2) Aligning the Red Dot Finder
On / Off /Brightness Level Switch
Battery Compartment
Altitude
Adjustment Control
Azimuth
Adjustment Control
(Figure 8)
(Figure 9)
A. Remove the plastic spacer in order to allow contact with the battery.
B. Slide the Red Dot ON/OFF switch to Brightness Level 1 or 2. (Figure 8)
C. Insert a low power eyepiece into the telescope’s focuser. Locate a bright object and
position the telescope so that the object is in the center of the feild of view.
D. With both eyes open, look through the sight tube atthe object . If the red dot overlaps
the object, your Red Dot Finder is perfectly aligned. If not , turn its atitude (Figure 8)
and azimuth (Figure 9) adjestment controls until the red dot is merged with the object
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2) Operating the AZ3 mount
This mount has controls for movement in altitude (up-down) and azimuth (left-right). Coarse
azimuth movement is controlled by a locking knob located near the tripod head for left-right
rotation. Loosen the knob to make large direction changes then lock it for fine
adjustments. Coarse Altitude movement is controlled by a friction bolt. Use the micro-
adjustment control cables to make small altitude and azimuth movements such as
centering objects in view. The micro-adjustment controls have limited travel so it is best
to center them on their threads before making a coarse adjustment.
3) Focusing
Slowly turn the focus knobs, one way or the other, until the image in the eyepiece
is sharp. The image usually has to be finely refocused over time, due to small
variations caused by temperature changes, flexures, etc. This often happens with
short focal ratio telescopes, particularly when they haven't yet reached outside
temperature. Refocusing is almost always necessary when you change an eyepiece
or adding or removing a Barlow lens (see Figure 11).
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4) Pointing your telescope
Pointing an altitude-azimuth (alt-az) mounted telescope is relatively easy. With the
mount level, you can swivel the telescope aroundon a plane parallel to your horizon
and then tilt it up and down from there. You can think of it as turning your telescope in
azimuth until it is facing the horizon below a celestial object and then tilting it up to
the object's altitude. However, the Earth rotates and therefore the stars are
constantly moving, so to track with this mount you need to constantly nudge the
optical tube in both azimuth and altitude to keep the object in the field.
In reference material for your local position, the altitude will be listed as ±degrees
(minutes, seconds) above or below your horizon. Azimuth may be listed by the cardinal
compass points such as N, SW, ENE, etc., but it is usually listed in 360 degree (minutes,
seconds) steps clockwise from North (0°), with East, South and West being 90°, 180° and
270 °, respectively.
5) Calculating the magnification (Power)
The magnification produced by a telescope is determined by the focal length of the
eyepiece that is used with it. To determine a magnification for your telescope, divide its
focal length by the focal length of the eyepieces you are going to use. For example, a
10mm focal length eyepiece will give 80X magnification with an 800mm focal length
telescope.
When you are looking at astronomical objects, you are looking through a column of air that
reaches to the edge of space and that column seldom stays still. Similarly, when viewing
over land you are often looking through heat waves radiating from the ground, house,
buildings, etc. Your telescope may be abl e to give very high magnification but what you
end up magnifying is all the turbulence between the telescope and the subject. A good rule
of thumb is that the usable magnification of a telescope is about 2X per mm of aperture
under good conditions
magnication = = = 80x
Focal legth of the telescope
Focal legth of the eyepiece
800mm
10mm
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6) Calculating the field of View
The size of the view that you see through your telescope is called the true (or actual) field of
view and it is determined by the design of the eyepiece. Every eyepiece has a value, called
the apparent field of view, which is supplied by the manufacturer. Field of view is usually
measured in degrees and/or arc-minutes (there are 60 arc-minutes in a degree). The true
field of view produced by your telescope is calculated by dividing the eyepiece's apparent
field of view by the magnification that you previously calculated for the combination. Using
the figures in the previous magnification example, if your 10mm eyepiece has an apparent
field of view of 52 degrees, then the true field of view is 0.65 degrees or 39 arc-minutes.
To put this in perspective, the moon is about 0.5° or 30 arc-minutes in diameter, so this
combination would be fine for viewing the whole moon with a little room to spare.
Remember, too much magnification and too small a field of view can make it very hard to
find things. It is usually best to start at a lower magnification with its wider field and then
increase the magnification when you have found what you are looking for. First find the
moon then look at the shadows in the craters!
7) Calculating the exit pupil
The Exit Pupil is the diameter (in mm) of the narrowest point of the cone of light leaving your
telescope. Knowing this value for atelescope-eyepiece combination tells you whether your
eye is receiving all of the light that your primary lens or mirror is providing. The average
person has a fully dilated pupil diameter of about 7mm. This value varies a bit from person
to person, is less until your eyes become fully dark adapted and decreases as you get older.
To determine an exit pupil, you divide the diameter of the primary of your telescope (in mm)
by the magnification.
For example, a 200mm f/5 telescope with a 40mm eyepiece produces a magnification of 25x
and an exit pupil of 8mm. This combination can probably be used by a young person but
would not be of much value to a senior citizen. The same telescope used with a 32mm
eyepiece gives a magnification of about 31x and an exit pupil of 6.4mm which should be fine
for most dark adapted eyes. In contrast, a 200mm f/10 telescope with the 40mm eyepiece
gives amagnification of 50x and an exit pupil of 4mm, which is fine for everyone.
True Field of View = = = 0.65
Apparent Feild of View
Magnication
52
80x
Exit Pupil =
Diameter of Primary mirror in mm
Magnication
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