Celestron Travel Scope 70 User manual

INSTRUCTION MANUAL
Model #22028-CGL

2IENGLISH
CONTENTS
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
SOLAR WARNING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
WHAT’S IN THE BOX. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
ASSEMBLING YOUR TELESCOPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Setting up the Tripod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Attaching the Telescope Tube to the Tripod . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Moving the Travel Scope Manually . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Installing the Diagonal & Eyepiece . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Installing the Finderscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Aligning the Finderscope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
TELESCOPE BASICS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Focusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Calculating Magnification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Determining Field of View . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
General Observing Hints . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TELESCOPE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Care and Cleaning of the Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
TECHNICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CELESTRON TWO YEAR LIMITED WARRANTY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

ENGLISH I3
Congratulations on your purchase of a Celestron Travel Scope. This telescope is constructed of high-quality materials to
give you a lifetime of pleasure with a minimal amount of maintenance.
This telescope was designed with traveling in mind with a compact and portable design with ample optical performance.
Your Travel Scope is ideal for terrestrial as well as casual astronomical observation.
The Travel Scope carries a two-year limited warranty. For details, see our website at www.celestron.com
Some of the Travel Scope’s key features include:
• Coated glass optical elements for clear, crisp images.
• An erect image diagonal so that your views are correctly oriented.
• A smooth functioning altazimuth mount to help you point the telescope at objects.
• A preassembled, full-size aluminum tripod for a stable platform.
• Quick and easy no-tool set up.
• A backpack for easy storage and transport.
Please read through this manual before you embark on your journey through the Universe. It may take a few observing ses-
sions to become familiar with your telescope, so you should keep this manual handy until you have fully mastered your tele-
scope’s operation. In it, you’ll find detailed instructions, reference material, and helpful hints to make your observing experience
as enjoyable as possible.
Before we begin, there are a few things to keep in mind to ensure your safety and protect your equipment.
INTRODUCTION
• Never look directly at the Sun with the naked eye or with a telescope unless you have the proper solar filter. Permanent and
irreversible eye damage may result.
• Never use your telescope to project an image of the Sun onto any surface. Internal heat build-up can damage the
telescope and any accessories attached to it.
• Never use an eyepiece solar filter or a Herschel wedge. Internal heat build-up inside the telescope can cause these devices
to crack or break, allowing unfiltered sunlight to pass through to the eye.
• Do not leave the telescope unsupervised, either when children or adults unfamiliar with the correct operating procedures of
your telescope are present.
SOLAR WARNING

4IENGLISH
Save your telescope box so you can use it to store the telescope when it is not in use. Unpack the box carefully as some
parts are small. Use the parts list below to verify that all parts and accessories are present.
PARTS LIST
WHAT’S IN THE BOX
ASSEMBLING YOUR TELESCOPE
We recommend setting up your telescope indoors the first time you use
it so you can familiarize yourself with its parts and the setup procedure.
In addition to the parts listed above, you’ll find one additional eyepiece
(both a 20mm eyepiece and a 10mm eyepiece are included), a Quick
Setup Guide, a Starry Night Basic Edition download code card, a
SkyPortal app download card, and an embroidered travel backpack
inside the box.
2
11. Finderscope
2. Eyepiece
3. Erect Image Diagonal
4. Focus Knob
5. Pan Handle Control Knob
6. Objective Lens
7. Telescope Optical Tube
8. Tripod Head Platform
9. Azimuth Locking Knob
10. Central Column Locking Knob
11. Tripod
7
3
4
6
8
9
10
11
5
Fig. 1 Travel Scope 70

ENGLISH I5
SETTING UP THE TRIPOD
1. The tripod comes preassembled. Start by spreading the legs
outward. At this point, the tripod will measure 16” tall. You can
use the tripod in this position on a tabletop or extend the legs
further for additional height.
2. To extend the tripod legs to your desired height, unlock the tripod
leg clamps at the bottom of each leg (Fig. 4) and pull down.
Close the leg clamp to secure each leg. When all three legs are
fully extended, the tripod will look like Fig. 5 and measure about
42” in height.
3. For an additional boost in height, you can raise the central
column at the top of the tripod. To do this, turn the central
column locking knob (Fig. 6) counterclockwise until it is loose.
Pull up on the head of the tripod until you reach your desired
height. Then tighten the locking knob. The maximum height of
the tripod is 49”.
Fig. 3
Fig. 4
Fig. 5
Fig. 6

6IENGLISH
ATTACHING THE TELESCOPE TUBE TO THE TRIPOD
Before you attach the telescope tube, ensure that the all of the knobs on the tripod are locked and secure.
1. Remove the protective paper covering the optical tube.
2. Loosen the tripod platform knob (Fig. 7) by turning it counterclockwise.
Tilt the tripod platform up 90° as shown in Fig. 8. Tighten the knob to
secure the platform in place.
3. Under the center of the tripod platform, you will see a knob
(Fig. 9) that contains a 1/4”x20 screw. Insert the screw into one
of the threaded holes on the telescope tube’s mounting bracket. (It
doesn’t matter which hole you use.)
4. Hold the telescope tube with one hand and thread the screw into the
mounting bracket with the other hand. Now the assembly will look
like Fig. 10.
5. Loosen the tripod platform knob and lower the platform (with
telescope attached) to the level position. Tighten the knob to secure.
Fig. 7
Fig. 8
Fig. 9
Fig. 10
MOVING THE TRAVEL SCOPE MANUALLY
The Travel Scope is easy to move in any direction. To tilt the telescope up or down, use the Pan Handle Control Knob
(Fig. 1, #11). To pan the telescope side to side, use the Azimuth Locking Knob (top left knob in Fig. 7). Loosen the knobs
by turning them counterclockwise and tighten them by turning them clockwise.

ENGLISH I7
INSTALLING THE DIAGONAL AND EYEPIECE
The diagonal is a prism that diverts the light traveling through the telescope so you can observe at a more comfortable
viewing angle. The Travel Scope diagonal is an erect image model that corrects the image to be right side up and oriented
correctly left-to-right, which is much easier to use for terrestrial observing. You can rotate the diagonal to any position you
prefer. To install the diagonal and eyepiece:
1. Remove the cap from the opening at the rear of the telescope
tube and the caps from the barrels on the diagonal. Make sure
that the two setscrews on the rear of the telescope tube are
not protruding into the opening. Insert the small barrel of the
diagonal all the way into the rear opening of the telescope tube.
Tighten the two setscrews to secure the diagonal in place,
taking care not to overtighten.
2. Make sure the setscrew at the other end of the diagonal is not
protruding into the opening. Place the chrome barrel end of
the eyepiece into the diagonal and tighten the setscrew, taking
care not to overtighten. Fig. 11
INSTALLING THE FINDERSCOPE
1. Locate the finderscope bracket. The finderscope is already
mounted inside.
2. Remove the knurled nuts on the threaded posts on the
telescope tube (Fig. 12).
3. Orient the finderscope so that the larger diameter lens is facing
toward the front of the telescope tube. Place the finderscope
bracket over the posts. Holding the bracket in place, thread the
knurled nuts onto the posts to secure the finderscope bracket
in place.
4. Remove the lens caps from both ends of the finderscope.
Fig. 12
Finderscope
Bracket
Finderscope
Eyepiece
Adjustment
Screws (3)
Knurled
Nuts
Objective Lens
Optical Tube
Eyepiece
Set Screws
Diagonal

8IENGLISH
CENTER THE TARGET
IN THE EYEPIECE
Look through the telescope using your lower
powered eyepiece. Move the telescope until the
object you chose lies in the center of the view. If the
image is blurry, gently turn the focus knobs until it
comes into sharp focus.
LOOK THROUGH FINDERSCOPE
Once the object is centered in your 20mm eyepiece,
look through the finderscope and locate the
crosshair reticle.
ADJUST THE FINDERSCOPE
Without moving the telescope, use the three
adjustment screws on the finderscope bracket to
move the finder around in the bracket until the
crosshair appears over the same object you are
observing in the telescope’s 20mm eyepiece.
TIP: Try adjusting one screw at a time. Loosen one screw by
half a turn and tighten another by the same amount to
ensure the finderscope is securely held in place.
YOUR FINDERSCOPE IS
NOW ALIGNED!
It should not require realignment unless it is bumped
or dropped.
The finder is one of the most important parts of your telescope. It
helps you locate objects and center them in the eyepiece. The first
time you assemble your telescope, you need to align the finder to
the telescope’s main optics. It’s best to do this during the day*.
* SOLAR WARNING! Never attempt to view the Sun through any
telescope without a proper solar filter!
CHOOSE A TARGET
Take the telescope outside during the day and find
an easily recognizable object, like a streetlight,
license plate or sign. The object should be as far
away as possible, but at least a quarter mile away.
ALIGNING THE
FINDERSCOPE
2 3
1
4 5
Low Power Eyepiece
Focus Knobs

ENGLISH I9
TELESCOPE BASICS
FOCUSING
To focus your Travel Scope, turn the focus knob located near the rear of the telescope (see Fig. 1). Turning the knob
counterclockwise allows you to focus on an object that is farther than the one you are currently observing. Turning the knob
clockwise from you allows you to focus on an object closer than the one you are currently observing.
Note: Remove the front lens cap of the Travel Scope optical tube prior to observing.
Note: If you wear eyeglasses, you may want to remove them when observing. However, if you have astigmatism, you should wear
your corrective lenses at all times.
Focal length of Telescope (mm)
Magnification = _____________________________
Focal length of Eyepiece (mm)
Let’s say, for example, you are using the 20mm eyepiece that came with your Travel Scope 70. To determine the magnification,
divide the focal length of your telescope (in this case, 400mm) by the focal length of the eyepiece, 20mm. Dividing 400 by
20 yields a magnification of 20x.
Although the power is variable, every telescope has a limit to its highest useful magnification. The general rule is that 60
power can be used for every inch of aperture. For example, the Travel Scope 70 is 2.8” in diameter. Multiplying 2.8 by
60 gives a maximum useful magnification of 168 power. Although this is the maximum useful magnification, most of your
observing will be done at lower power, which provides much brighter and sharper images.
Note on Using High Magnification: Higher powers are used mainly for lunar and sometimes planetary observing. Remember,
when magnification is high, contrast and brightness will be very low. For the brightest images with the highest contrast levels,
use lower powers.
You can purchase additional eyepieces to give you a range of powers to choose from. Visit the Celestron website to see
what is available.
CALCULATINGMAGNIFICATION
You can change the power of your telescope just by changing the eyepiece. To determine the magnification of your telescope,
simply divide the focal length of the telescope by the focal length of the eyepiece you are using. In equation format, the
formula looks like this:
DETERMINING FIELD OF VIEW
Determining the field of view is important if you want to get an idea of the angular size of the object you are observing. To
calculate the actual field of view, divide the apparent field of the eyepiece (supplied by the eyepiece manufacturer) by the
magnification. In equation format, the formula looks like this:
Apparent Field of Eyepiece
True Angular Field = ________________________________
Magnification
As you can see, before determining the field of view, you must calculate the magnification. Using the example in the previous
section, the 20mm eyepiece included with your Travel Scope 70 has an apparent field of view of 50°. Divide the 50° by the
magnification, which is 20 power. This yields an actual (true) field of 2.5°.
To convert degrees to feet at 1,000 yards (which is more useful for terrestrial observing) multiply by 52.5. Multiply the angular
field of 2.5° by 52.5. This produces a linear field width of 131 feet at a distance of one thousand yards.

10 IENGLISH
GENERAL OBSERVING HINTS
When using any optical instrument, there are a few things to remember to ensure you get the best possible image.
• Never look through window glass. Glass found in household windows is optically imperfect, and as a result, may vary in
thickness from one part of a window to the next. This inconsistency can and will affect the ability to focus your telescope. In
most cases, you will not be able to achieve a truly sharp image. In some cases you may actually see a double image.
• Never look across or over objects that are producing heat waves. This includes asphalt parking lots on hot summer days or
building rooftops.
• Hazy skies, fog, and mist can also make it difficult to focus when viewing terrestrially. You’ll see much less detail in objects
when observing in these conditions.
NOTE: Your telescope was designed for terrestrial observation as well as celestial viewing.
TELESCOPE MAINTENANCE
While your telescope requires little maintenance, there are a few things to remember to ensure your telescope performs
at its best.
CARE AND CLEANING OF THE OPTICS
Occasionally, dust and/or moisture may build up on the telescope’s objective lens. Take extra care when cleaning your
telescope’s optical components to avoid damaging them.
If dust has built up on the optics, remove it with a brush (made of camel’s hair) or a can of pressurized air. Spray at an angle
to the glass surface for approximately two to four seconds. Then, use an optical cleaning solution and white tissue paper to
remove any remaining debris. Apply the solution to the tissue and then apply the tissue paper to the optics. Low pressure
strokes should go from the center of the lens (or mirror) to the outer portion. Do NOT rub in circles!
You can use a commercially made lens cleaner or mix your own. A good cleaning solution is isopropyl alcohol mixed with
distilled water. The solution should be 60% isopropyl alcohol and 40% distilled water. You can also use a few drops of liquid
dish soap diluted into one quart of water.
Occasionally, you may experience dew build-up on the optics of your telescope during an observing session. If you want to
continue observing, the dew must be removed, either with a hair dryer (on low setting) or by pointing the telescope at the
ground until the dew has evaporated.
If moisture condenses on the inside of the optics, remove the accessories from the telescope. Place the telescope in a dust-
free environment and point it down. This will remove the moisture from the telescope tube.
To minimize the need to clean your telescope, replace all lens covers once you have finished using it. Since the cells are NOT
sealed, adding the lens covers will help prevent contaminants from entering the tube.
Internal adjustments and cleaning should be done only by the Celestron repair department. If your telescope is in need of
internal cleaning, please call the factory for a return authorization number and price quote.

ENGLISH I11
TECHNICAL SPECIFICATIONS Model # 22028 Travel Scope 70
Optical Design Refractor
Aperture 70mm (2.8")
Focal Length 400mm
Focal Ratio f/5.7
Optical Coatings Fully Coated
Finderscope 5x24
Diagonal Erect Image - 45° 1.25"
Eyepieces 20mm 1.25" (20x)
10mm 1.25" (40x)
Apparent Field of View 20mm @ 50°
10mm @ 50°
Angular Field of View 20mm @ 2.5°
10mm @ 1.3°
Linear Field of View –
ft/1000 yards 20mm @ 131/44
m/1000 meters 10mm @ 67/22
Near Focus w/20 mm Eyepiece 19’ (5.8 m)
Mount Altazimuth (Photo Tripod)
Altitude Locking Knob Yes
Azimuth Locking Knob No
Astronomy Software Download Yes
Highest Useful Magnification 168x
Limiting Stellar Magnitude 11.7
Resolution -- Raleigh (arc seconds) 1.98
Resolution -- Dawes Limit “ “ 1.66
Light Gathering Power 100x
Optical Tube Length 431.8mm (17”)
Telescope Weight 1.5lb (.68 kg)
Note: Specifications are subject to change without notice or obligation.

©2022 Celestron. Celestron and Symbol are trademarks of Celestron, LLC. All rights reserved. Celestron.com
Torrance, CA 90503 USA
This product is designed and intended for use by those 14 years of age and older. (Most of our products are 14+,
unless they are toys).
SOLAR WARNING: Never attempt to view the sun through any telescope
without a proper solar filter.
NEED ASSISTANCE?
Contact Celestron Technical Support
celestron.com/pages/technical-support
Printed in China
08-22
CAUTION: Changes or modifications not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.
TWO-YEAR LIMITED WARRANTY
Our telescope has a TWO-YEAR LIMITED WARRANTY. For detailed information and to register your new product, please
visit celestron.com/pages/warranty
In Association with Royal Observatory of Greenwich.