Citiwell OR7090 User manual

orbitor
50mm
90X Refractor Telescope
Instruction Manual
Instruction Manual: Part # 261668

2
WARNING!
NEVER aim your telescope at the sun or even close to the sun!
Instant and irreversible damage can occur,
including blindness!
Do not let children use any telescope without adult supervision.
Here are the main
p
arts of
y
our telesco
p
e:
A: 20mm. Eyepiece
B: Focus Tube
C: Telescope Tube
D: Dew Shield
E: Diagonal Mirror
F: Focus Knob
G: Azimuth Lock Knob
H: Objective Lens (Not in view)
I: Altitude Lock Knob
J: Altazimuth Mount
K: Aluminum Tripod Leg
L: Dust Cap
M: 4mm. High Power Eyepiece
N: Tripod Supports
D
H
J
I
K
N
A
B
C
E
F
G
L
M

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Introduction:
Congratulations! You are now the owner of an orbitortelescope. With proper care and
handling of your telescope, you will have hours of fun looking at nature’s wondrous sights for
many years.
This telescope has been designed to show you the moon’s craters, Jupiter’s major moons,
and Saturn’s rings. It also delivers great views of mountains, valleys, and many other
subjects, near and far, in the world around us.
You can use your telescope as a terrestrial (land) telescope to study birds, animals and
landscapes at a distance. To obtain the best performance from your new telescope, please
read this manual carefully and completely.
ASSEMBLY:
1.) Carefully remove all parts from the cardboard cartons and lay them on a table or floor 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.) Spread the three legs of the table-top tripod apart and gently press down on the center
of the tripod supports until they lock into place. (Picture #1)
(Picture #1)
!
WARNING!
CHOKING HAZARD
Small parts. Not suitable for
children under 3
y
ears.

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3.) Place the telescope tube over the altazimuth mount. Lower the telescope tube onto the
mount so that the plastic tongue on the mount slips into the bracket underneath the
telescope tube. (Picture #2)
(Picture #2)
4.) One of the short bracket arms has a hexagonal shaped cutout around its opening. Insert
the nut from the altitude lock knob into this cutout. Insert the altitude lock knob through
the bracket and tongue as shown in Picture #3. Turn the altitude lock knob clockwise
into this nut until it stops.
(Picture #3)
5.) Turn the tightening knob on the tripod mount clockwise until it stops. The telescope is
now securely attached to the tripod.
6.) Loosen the small chrome screw on the side of the focus tube by turning it
counterclockwise. Insert the shiny chrome end of the diagonal mirror into the focus tube
so that the opposite open end is facing upward. Tighten the small chrome screw on the
side of the focus tube to hold the diagonal mirror securely in position. (Picture #4)
(Picture #4)
7.) Loosen the small chrome screw located on the side of the diagonal mirror by turning it
counterclockwise.

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8.) Insert the low power eyepiece marked “H20mm” into the diagonal mirror. Tighten the
small chrome set screw by turning it clockwise to hold the eyepiece securely in place.
(Picture #5)
(Picture #5)
THE ALTAZIMUTH MOUNT
This telescope is fitted with an Altazimuth mount. “Altitude" refers to the vertical, or “up and
down” movement of the telescope, while "Azimuth" refers to the horizontal, or “side-to side”
movement.
ABOUT MAGNIFICATION
The magnification power of a telescope indicates how much an image is enlarged or how big
and close it appears to the viewer. The focal length of the eyepiece, combined with the focal
length of the telescope, determine the magnification power. To calculate the power of your
telescope with any particular eyepiece, simply divide the focal length of the telescope
(360mm) by the focal length of the eyepiece (indicated in “mm” on the eyepiece collar).
Example: 360mm focal length (tube) = 18X magnification power
20mm focal length (eyepiece)
The two interchangeable eyepieces included, provide the following magnification powers:
Eyepiece Power
20mm 18X
4mm 90X
The level of magnification required depends on the object being observed.
A lower magnification power with a wider field of view is good for observing galaxies and
nebulae. Higher magnification powers should only be used for highly detailed observations of
the moon, Jupiter, and Saturn, or any object that is extremely bright

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USING YOUR TELESCOPE
1) Take your telescope outside. Viewing objects through closed or open windows is not
recommended. Your view can be distorted by reflections in the glass of a closed window
or by air currents, of differing temperatures, passing through an open window.
2) Let your telescope adjust to the outside temperature. Your telescope will perform much
better if the lenses and the air inside the tube are the same temperature as outside. It may
take up to 30 minutes to equalize the temperatures when the difference in temperatures is
extreme.
3) Find a location far from glaring light. If you live in an urban area, your viewing will probably
improve the farther you move away from the city lights. The skyglow of a town or city can
dramatically reduce the telescope’s performance and viewing capabilities.
When possible, avoid sudden temperature changes, as the moisture in the air will condense
on the objective lens. Should this occur after bringing your telescope inside, leave the lens
cap off the objective lens, tilt the objective (front) lens face down, and wait until the telescope
reaches room temperature.
With the diagonal mirror already attached and in place, we recommend starting your viewing
with the low power 20mm eyepiece because it gives you the widest angle with the brightest
and sharpest views. To adjust the angle of the telescope, loosen the azimuth lock knob by
turning it counterclockwise. Adjust the telescope to the desired angle, then tighten the
azimuth lock knob.
NOTE: When using the diagonal mirror, objects will appear right-side up in your
telescope, but reversed, like a reflection in a mirror. This is normal, and does not
indicate a defect.
Care and Cleaning of Optics
Optical components of a telescope get dirty over time. Dirt or dust on a lens should be
removed only with the utmost care. A considerable amount of dirt or dust would have to
accumulate on the optical surface before your view would be compromised.
1.) Keeping any dust caps on during storage and transport will reduce dust collection.
2.) Condensation may collect on the optical surfaces when the telescope is not in use.
Remove the dust caps and allow the moisture to evaporate naturally. Point the telescope
downwards to minimize the accumulation of airborne dust.
3.) Once all moisture has evaporated, replace the dust caps.
4.) Filtered compressed air may be used to remove surface dust from lenses and mirrors.
Remove the dust cap and the dew shield. Once removed, point the can away from the
lens and gently expel some air and any condensation or dust that has accumulated on the
discharge tube. Spray the lens or mirror with short bursts of air to carefully remove the
dust particles. DO NOT HOLD THE TRIGGER OF THE COMPRESSED AIR CAN FOR

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EXTENDED PERIODS BECAUSE PROPELLANT FROM THE CAN MIGHT ESCAPE
AND DAMAGE THE OPTICAL SURFACE.
If, after several attempts, you cannot remove the particles, take the telescope to an optical
professional for cleaning.
If you keep the dust caps on your telescope when it is not in use and avoid handling the
lenses or mirrors, only minimal optical maintenance of your telescope should be required.
Extensive cleaning is usually only necessary every few years.
What to Look For in the Sky
There is a whole universe of objects you could view at night, so where do you start? We
recommend starting with the most prominent objects first.
The moon
The moon is the easiest target to find at night. When the moon is in full position, it bathes the
night with a silvery light that washes the sky of all but the brightest objects. The best time to
view the moon is not when it is full, but rather when it is less than half full. The dividing line
between dark and light on the moon, called the terminator, shows the best detail in the
craters and mountains.
The planets
The planets, our solar system companions, range in size from moon-size rocky bodies to
giant gas balls, which could hold Earth 1000 times over. To find the planets, you will need
information about their times of visibility. An astronomy magazine will give you the locations
of the planets, as they change position from month to month. The Internet is also an excellent
source of information, starcharts, maps, and more! The popular and more familiar
constellations often provide the easiest landmarks to help find the planet’s locations and
paths of orbit. Most people have looked up at night and seen some of the planets without
even realizing it. A planet appears like a bright star but does not twinkle like a star; it will look
like a tiny ball. Venus, Mars, Jupiter, and Saturn, are the easiest planets to view. Mercury is
dimmer, usually below the horizon, and is more challenging to find.
Each of the planets provides interesting views. Venus is covered with clouds so all that is
visible is an extremely bright light, the brightest next to the moon. Venus, like the moon, goes
through phases, however. As it travels around the sun, different areas of the planet’s surface
are illuminated, producing crescent shapes of varying size. Mars is the red planet. When it is
above the horizon, it is noticeably red and stands out like a beacon in the night sky. The
apparent brightness of Mars varies as the planet orbits around the sun and throughout its
period of visiblity, it will brighten and dim depending on how near or far it is from Earth.
Jupiter is the largest planet in our solar system and the second brightest next to Venus.
Jupiter has many moons, four of which are often visible through your telescope, when
viewing conditions permit. As you watch them throughout the evening, you will see that they
change position relative to each other and to Jupiter. It is possible with careful planning to

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actually see one of the moons disappear either in front of or behind Jupiter as it orbits around
the planet.
Saturn, the second largest planet, is not as bright as Jupiter and so its moons are not as
visible through small telescopes. The large rings that encircle Saturn are spectacular to
observe, however. The planet and its rings appear pale yellow.
FREQUENTLY ASKED QUESTIONS:
1) How far can I see?
If you stand outside and look up at the night sky on a clear evening, you can see hundreds of
stars with the unaided eye. The telescope is a light-gathering instrument which magnifies the
view—providing significantly more detail and unveiling more stars, nebulae, and celestial
objects. With the aid of a telescope, you will be able to enjoy exciting views of Saturn’s rings,
Jupiter’s major moons, the Orion Nebula, and much more.
2) Why can’t I see anything?
If you see only gray or black when looking through your telescope, even after searching for
an object to view, it is very likely that you are using an eyepiece that is too powerful. To solve
this problem: Always start with the lowest power eyepiece first, and only insert the higher
power eyepiece after you have found an object. Also, be sure to remove the dust cap from
the lens.
3) When I use my high power eyepiece, everything looks much darker. Why?
As magnification in a telescope increases, brightness diminishes. Conversely, brightness
increases when magnification is reduced. If an image appears too dark or unclear, use a
lower-powered eyepiece. Views of small, bright objects are better than those of large, dark or
blurry ones! Atmospheric conditions, air currents, as well as light and air pollution also affect
viewing quality.
4) As I look through my telescope, objects in the sky appear to move. Why is that?
The constant rotation of the earth makes things appear to move. Lower-power eyepieces will
reduce this effect of movement considerably and allow you to observe an object for a longer
duration before you have to readjust your telescope.
Part #261668