Celestron 22470 Manuel utilisateur

#22470 STARSENSE EXPLORER 8” DOBSONIAN #22471 STARSENSE EXPLORER 10” DOBSONIAN

INSTRUCTION MANUAL

2 I ENGLISH

INTRODUCTION

Congratulations on your purchase of the StarSense Explorer Dobsonian (SSE Dob) telescope. Your SSE Dob combines large

optics with the exciting StarSense Explorer dock and app to make ﬁnding and observing all kinds of astronomical objects fun

and easy! You’ll be able to locate faint deep-sky objects—galaxies, nebulae, star clusters and more— and place them within the

ﬁeld of view of the eyepiece in seconds. The large primary mirror collects lots of light, enabling you to see details in objects that

you have never seen before.

Before you take your StarSense Explorer Dob outside for your ﬁrst night of observing, we recommend reading through this

manual. It will help you to better understand the features of your telescope and know what to expect.

ENGLISH I 3

TABLE OF CONTENTS

What’s in the Box . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Base Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Telescope Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pointing the Telescope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Focusing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Using the StarPointer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

StarSense Explorer Dock and App . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Determining Magniﬁcation and Selecting Eyepieces . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Cooling your Telescope’s Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Your First Night Out - What to Expect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Dark Adaptation and Light Pollution . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Use of Filters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

Collimating the Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Transporting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Care and Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Speciﬁcations StarSense Explorer 8” Dobsonian . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Speciﬁcations StarSense Explorer 10” Dobsonian. . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

Solar Warning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

4 I ENGLISH

A1

P

OQ

E

F

K1 K2 L1 L2

M

J1 J2

H1 H2 H3 H4 H5

G1 G2 G3

A2 B C D

N1

N2

R1

S

T

U

WHAT’S IN THE BOX

Box 1 - Dobsonian Base

Box 2 - Optical Tube Assembly

Left side panel

Feet (x3)

AZIMUTH PIVOT BOLT ASSEMBLYFEET ASSEMBLY

HANDLE ASSEMBLY EYEPIECE RACK ASSEMBLY

INCLUDED TOOLS

ALTITUDE BEARING ASSEMBLY

Base

handle

Eyepiece rack

Rubber

bumper

Optical tube assembly with dust cover

25mm Omni

Plössl eyepiece

2”-to1.25” eyepiece

adapter with 1.25”

cover cap

2” focuser

extension tube

Collimation cap with

2mm and 2.5mm hex keys*

*2.5mm hex key included with 8” Dob only

NOTE: For collimating your telescope’s

optics, refer to page 14

Altitude

tensioning knob

Cosmetic knob

Screwdriver

StarSense dock StarPointer

red dot ﬁnderscope

Crescent

wrenches (x2)

Hex keys (x2)

Rack

Screws (x2)

Altitude bearing

cylinders (x4)

Bearing

screws (x4)

Handle

screws (x2)

Feet screw

covers (x3)

Feet screws

(x3)

Bolt Nut Steel

washers

(x2)

Hollow

plastic

cylinder

Teﬂon

washer

Right side panel Front panel Top plate Bottom plate

Side supports

(x2)

Base assembly

screws (x22)

ENGLISH I 5

BASE ASSEMBLY

A1

A2

E

F

K1

L1

L2

H1

H2

H3

H4

H5

J1

J2

B

C

D

G1

G2

G3

Figure 1A: Exploded view of the StarSense

Explorer Dobsonian base.

6 I ENGLISH

N1

N2

O

Q

P

R1

T

S

Figure 1B: Exploded view of the StarSense Explorer Optical Tube Assembly

Refer to Figure 1 to see how the parts of the SSE Dob ﬁt together.

For detailed assembly instructions, refer to the printed Quick Setup Guide included in the box, or on the SSE Dob product page

at www.celestron.com

TELESCOPE ASSEMBLY

ENGLISH I 7

POINTING THE TELESCOPE

Dobsonian bases are altazimuth mounts. This means that

the telescope moves in two directions: up-and-down

(i.e. altitude), and left-to-right (i.e. azimuth) (Figure 2).

ALTITUDE

AZIMUTH

Figure 2: The StarSense Explorer Dobsonians have two axes of motion:

altitude (up-and-down) and azimuth (left-to-right).

Pointing your Dob at an object is easy. Simply move the

telescope tube up-and-down and left-to-right until the

telescope is pointed toward the desired object and the

object appears in the telescope’s eyepiece. The panning

knob at the front of the telescope tube provides a convenient

place to grasp the tube for pointing (Figure 3). Using this

knob also prevents heat from your hand from entering the

optical path, which can temporarily distort the view.

Figure 3: The panning knob provides an excellent place for your ﬁngers to

grasp when pointing the telescope.

You can adjust the tension along the altitude axis by turning

the knob located on the same side as the telescope’s

focuser—the altitude tensioning knob (Figure 4).

Figure 4: The tension of the altitude motion can be adjusted with the

altitude tensioning knob. (NOTE: the other knob on the opposite side does

not function for adjusting altitude tension.)

Turn the knob to add enough tension to provide a smooth

up-and-down motion. Under most circumstances you won’t

need to add much tension. The telescope is balanced for

normal use. However, if you are using a heavy eyepiece or

a larger smartphone, you may need to add more tension so

that the telescope remains still when not touched.

8 I ENGLISH

FOCUSING

The SSE Dobs come with a 2” Crayford focuser, a 2”

extension tube, and a 2”-to-1.25” eyepiece adapter.

With these three items, you can use virtually any telescope

eyepiece with the SSE Dob.

For most eyepieces, make sure the 2” extension tube

is in place in the focuser. If it’s not, the eyepiece will not

reach focus. If you’re using an eyepiece that requires a lot of

inward focus travel, remove the 2” extension tube. You may

need to remove the tube if attempting to use your Dob with

an astronomical imaging camera.

If you wish to use a 1.25” format eyepiece, you’ll need to

use the 2”-to-1.25” eyepiece adapter. Simply place it in the

focuser (with 2” extension tube attached), and then place

the 1.25” eyepiece in the adapter. Tighten the thumbscrew

on the adapter to secure the eyepiece in place. The adapter

uses an internal brass compression ring so your eyepiece

barrel won’t be scratched or marred.

To focus, turn the focus knobs clockwise or counterclockwise

until the object in the telescope eyepiece is in sharp focus.

To lock the focuser position in place once you have achieved

sharp focus, tighten the focus lock thumbscrew (Figure

5). If you need to adjust the focus knob’s tension, you can

tighten or loosen the focuser tensioning set screw using the

provided hex key.

FOCUS LOCK

THUMBSCREW

FOCUSER

TENSIONING

SET SCREW

Figure 5: The focus lock thumbscrew locks the focuser in place once

focus has been achieved. The focus tensioning set screw adjusts the

tension of the focusing knobs.

Since the SSE Dob is a Newtonian reﬂector, the images

you’ll see will appear upside-down as compared to the

naked eye (Figure 6). While this has little impact on

astronomical observing, it can be a bit confusing when you

are viewing land-based objects.

Figure 6: Like all Newtonian reﬂectors, the SSE Dobs produce images

that appear upside-down as compared to the naked eye.

VIEW THROUGH NEWTONIAN REFLECTOR TELESCOPE

NAKED EYE VIEW

ENGLISH I 9

USING THE STARPOINTER

Although you won’t need to rely on the StarPointer red-dot

ﬁnder when you are using the StarSense Explorer app, it can

help you align the app with the telescope. The StarPointer

also comes in handy when you are locating objects during

the day, since the app only works under the stars at night.

To align the StarPointer, ﬁrst point the telescope at an

object that is at least ¼ mile away. We recommend aligning

during the day. Choose a distant tree, sign, building, or

other landmark. If you are aligning at night, you can use a

streetlight, the Moon, or a bright star or planet.

Once you have pointed the telescope at the object, check

to ensure that it appears in the eyepiece. Next, turn the

StarPointer on using the LED dial (Figure 7).

LED DIAL

ALTITUDE KNOB AZIMUTH KNOB

Figure 7: The StarPointer red-dot ﬁnderscope.

Turn up the brightness level until you can easily see the

red dot. Now, without moving the telescope, use the

StarPointer’s altitude and azimuth adjustment knobs to

center the red dot on the same object that you centered

in the telescope eyepiece. When you’re ﬁnished, check

to make sure the object is still centered in the telescope

eyepiece. If it is, you are done aligning the StarPointer. If

not, move the telescope so the object in the telescope’s

eyepiece is centered again. Continue using StarPointer’s

altitude and azimuth adjustment knobs to center the red dot

on the object again.

Turn off the StarPointer when you aren’t using it to conserve

its battery. While the StarPonter’s battery should last a long

time, eventually it will need to be replaced with a CR2032

3V Lithium button cell battery. These are very common and

available from a wide variety of retailers.

To replace the battery:

1. Use a Phillips-head screwdriver to remove the battery

cover securing screw (Figure 8).

Figure 8: To open the StarPointer’s battery cover, ﬁrst remove the

securing screw.

2. Remove the discharged battery from the battery com-

partment. You may need to use a knife or screwdriver to

pry the battery out of its holder.

3. Insert the new battery so that the positive side is visible to

you. Make sure the battery is properly seated within the

battery compartment (Figure 9).

Figure 9: When the battery is properly seated in the compartment as

shown, the battery cover should be easy to reinstall.

4. Close the battery compartment and reinstall the securing

screw.

10 I ENGLISH

STARSENSE EXPLORER DOCK

AND APP

Perhaps the most exciting feature of the StarSense

Explorer Dobsonian is the StarSense Explorer dock and the

StarSense Explorer smartphone app. With the app to guide

you, you’ll spend more time observing objects instead of

struggling to ﬁnd them among myriad stars overhead! The

Celestron StarSense Explorer is the only Dobsonian that

includes this incredible feature.

To begin, download and install the app from the Apple

App Store (iOS) or Google Play (Android). You’ll also ﬁnd

the minimum system requirements there. If you have any

questions about whether your smartphone is compatible

with the app, please visit celestron.com/SSE

Once you have downloaded the app, use the app unlock

code that you’ll ﬁnd on the printed card that came with your

telescope (Figure 10).

Download the app from the

before your first observing session

.

or

When prompted, enter the unique unlock code below to

enable telescope control on your device.

Figure 10: The StarSense Explorer App unlock code is printed on the card

included with your telescope.

Each code can enable up to ﬁve devices to use the

StarSense Explorer functionality. If you use the code all ﬁve

times and need to unlock the app on more devices, please

contact Celestron Technical Support at celestron.com/

pages/technical-support for options.

With the app unlocked, you are ready to begin. Place your

smartphone into the StarSense Explorer dock and press

the StarSense icon at the bottom of the planetarium screen

(Figure 11).

Choose the “NEEDS ALIGNMENT” option and follow the

on-screen prompts to align the smartphone’s camera with

the telescope. Once this procedure is complete, you can

use the app to locate objects.

Select an object to view from the planetarium or the

“Tonight’s Best” list (i.e. press the star icon). Arrows will

appear on screen, guiding you to the object. Follow the

arrows until the bullseye turns green and the object is in

your telescope’s ﬁeld of view. It’s that easy!

While you observe, you can read detailed information about

the object. Hundreds of the most popular objects also offer

an audio presentation. To listen, press the bar at the bottom

of the screen that contains the object’s name (Figure 12).

STARSENSE ICON

Figure 11: Once you have unlocked the StarSense Explorer app, press the

StarSense icon to begin ﬁnding objects.

Figure 12: Press the Object Info bar to receive additional information about

the selected object, including images and audio presentations for many

objects.

ENGLISH I 11

DETERMINING MAGNIFICATION

AND SELECTING EYEPIECES

To change the magniﬁcation of the telescope, you’ll need

to swap out the eyepiece in the telescope’s focuser. To

calculate the magniﬁcation you can achieve with a given

eyepiece, use this formula:

Focal length of telescope ÷

Focal length of eyepiece

= Magniﬁcation

The SSE Dobs have a focal length of 1200mm. They come

with a 25mm Omni Plössl eyepiece. Using the formula, we

can calculate that this combination yields a magniﬁcation

of 48x (1200mm ÷ 25mm = 48x). This is an excellent

magnification for locating and observing wide-field deep

space objects. You may want to consider purchasing a

higher-magniﬁcation eyepiece, like a 10mm Omni Plössl,

for higher-power views of the Moon and planets. Do not

increase magniﬁcation too much though, or the view may

degrade due to atmospheric seeing conditions (i.e. air

turbulence).

The maximum magniﬁcation for any telescope is about 60

times per inch, which equates to 480x for the 8” SSE Dob,

and 600x for the 10” SSE Dob. In many locations, however,

it will be difﬁcult to achieve sharp images much over 100x

magniﬁcation due to turbulence in the air above you. If you

notice that the stars overhead are twinkling heavily, seeing

conditions are poor. You should stick to lower magniﬁcation.

If the stars appear to shine steadily, seeing conditions are

good. You can try using higher-magniﬁcation eyepieces.

The SSE Dobs can accept both 1.25” and 2” format

eyepieces. 2” eyepieces generally provide a wider ﬁeld of

view but can cost signiﬁcantly more. To use a 2” eyepiece,

remove the 2”-to-1.25” adapter from the focuser and insert

the eyepiece directly into the 2” extension tube. Secure the

eyepiece with the thumbscrews on the 2” extension tube.

The eyepiece rack located on the front of the base provides

a convenient place to put eyepieces when they are not

in use. It can accept three 1.25” eyepieces and one 2”

eyepiece (Figure 13).

Figure 13: The eyepiece rack is a convenient place to store additional

eyepieces during your observing session.

DETERMINING MAGNIFICATION AND SELECTING

EYEPIECES

COOLING YOUR

TELESCOPE’S OPTICS

You’ll get the best views through your telescope when it

has reached thermal equilibrium with the ambient air. If the

telescope is warmer than the outside air, the mirror will

be acclimating to the temperature and its ﬁgure will be

changing. The images you see through a telescope that

has not cooled will not appear as sharp as they otherwise

would. If you are taking your telescope from a heated house

to the outdoors, allow around one hour before expecting it

to produce sharp images. For this reason, we recommend

storing your telescope in a dry but unheated area like a

garage or storage shed.

For the 10” SSE Dob, there is an optional USB Cooling Fan

for Dobsonians available. It mounts onto the rear of the mirror

cell and blows air on the mirror to expedite cooling (Figure

14). The fan will help the optics reach thermal equilibrium

faster. (The 8” SSE Dob does not have a fan mount so it is

not compatible with the Cooling Fan.)

Figure 14: The optional USB Cooling Fan for Dobsonians is compatible with

the 10” SSE Dob..

12 I ENGLISH

YOUR FIRST NIGHT OUT 

WHAT TO EXPECT

You can observe literally thousands of objects with the

larger aperture of the SSE Dobs:

The Moon

Observing the lunar surface is a great place to start. You’ll

easily see craters, maria, lacus, valleys, mountains, and

other features. The Moon is so bright that you might want

to consider using an optional Moon ﬁlter. It threads onto

bottom of the eyepiece to dim the view. We also recommend

a higher-power eyepiece to help you explore the Moon

up-close.

Planets

The best planets to view are Jupiter, Saturn, Mars, and

Venus. A higher-power eyepiece will help bring out the

ﬁne details. You’ll be able to see the rings of Saturn,

surface detail on Jupiter along with its moons, the phases

of Venus, and perhaps some surface detail on Mars if it is

near opposition (i.e. when it is closest to the Earth).

Stars and Double Stars

Stars will appear like points of light regardless of the

magniﬁcation used. However, a telescope can reveal a

star’s color and also “split” double stars using higher

magniﬁcations. For variable stars, see if you can detect

a star’s change in brightness over a period of days or

weeks.

Open Star Clusters

These are star groups that formed together within our

Milky Way galaxy. They can appear spectacular in the

telescope eyepiece, even from somewhat light-polluted

skies. Astronomers often describe star clusters as

resembling “crushed diamonds on black velvet” in the

telescope’s eyepiece. Clusters are generally best viewed

with low-power eyepieces, as they usually require a wide

ﬁeld of view to see the entire cluster.

Globular Star Clusters

These are tight clusters of hundreds of thousands of

stars that coalesced early in our galaxy’s formation. These

clusters appear like globes of light. The brighter ones can

be resolved into individual stars in good conditions. Most

globular clusters are best viewed with a medium-power

eyepiece, as they are not nearly as wide as open clusters,

yet not bright enough for high power either.

Nebulae

You’ll generally need to be under dark skies to see

gaseous nebulae, which appear as a faint glow around

stars. Don’t expect to see any nebulosity from urban skies

except for perhaps the brightest ones, like the Orion

Nebula and Lagoon Nebula.

Galaxies

Perhaps the most fascinating of all objects to view,

galaxies are like “island universes” unto themselves.

While you can detect the brightest galaxies, like the

Andromeda Galaxy, from somewhat light-polluted skies,

they are best observed from dark skies. Literally hundreds

of galaxies are well within the observing reach of the SSE

Dobs. The best ones display ﬁne details like faint spiral

arms and dust lanes. Many, however, will just appear as

non-stellar “streaks” or “blobs.” Even so, just being able

to detect the light from another galaxy outside our own is

rewarding in itself.

One thing to keep in mind is that the SSE Dobs are not

motorized. This means that they will not automatically track

celestial objects as the Earth rotates. As a result, you will

notice that objects drift a bit as you observe them and will

exit the eyepiece’s ﬁeld of view within a minute or two,

depending on the magniﬁcation you are using. Objects will

drift out of the ﬁeld of higher-power eyepieces faster, since

their ﬁeld of view is narrower. You will need to manually push

the Dob along to keep objects centered over time. This is

easy to do. Grab hold of the telescope’s panning knob and

move it slightly up-and-down and left-to-right as needed.

ENGLISH I 13

DARK ADAPTATION AND

LIGHT POLLUTION

It takes at least a half-hour for the human eye to become

dark-adapted, so don’t immediately expect to see subtle

detail in faint deep-sky objects as soon as you get outside.

While you are observing, avoid any bright lights (like

going from outside to inside a lighted house) or else your

dark adaption will need time to reset. Use red ﬂashlights

designed for astronomical use, as the red light will not

greatly affect your night vision. The Moon will also affect

your dark adaptation, so if you directly observe the Moon

expect it to take time to regain your night vision.

Local light pollution will greatly diminish the appearance

and contrast of fainter deep-sky objects in the telescope.

Do not expect to see much detail from urban skies. You’ll

get your best views from dark sky locations away from city

or suburban night lighting. Bright objects such as the Moon,

planets, double stars, and bright open star clusters are not

affected by light pollution as much, so they make good

objects for backyard viewing regardless of where you are.

Also keep in mind that the Moon itself can light up much of

the night sky, preventing views of faint objects even from

dark sites. So schedule deep sky observing when the Moon

won’t be visible.

USE OF FILTERS

Experiment with adding optional ﬁlters to your setup to

help improve the view. Astronomical ﬁlters thread onto the

bottom of your eyepiece and usually come in both 1.25” and

2” formats. Simply remove the eyepiece from the focuser,

thread the ﬁlter onto the bottom of the eyepiece’s barrel,

and then reinsert it into the focuser.

There are many useful ﬁlters to choose from:

Moon Filter – An essential for viewing lunar details, this

ﬁlter cuts down on glare and makes bright objects dimmer.

Variable Polarizer – Like a Moon ﬁlter, a polarizer dims your

view. The key difference is that you can customize the extent

of the dimming effect by rotating the polarizer.

Color Filters – Available in a variety of colors, these can

improve contrast when observing planetary details.

Light Pollution Filters – If you are viewing deep-space

objects from urban or suburban skies, these improve

contrast by blocking the “bad” light from local light pollution

and transmitting the “good light” from deep-sky objects.

You’ll notice the greatest improvement in contrast when

observing nebulae

14 I ENGLISH

COLLIMATING THE OPTICS

Collimation is the process of aligning the telescope’s optics.

Dobsonians use the Newtonian reﬂector optical design,

which consists of a parabolic primary mirror and a ﬂat

secondary mirror. To ensure best performance, you should

periodically check the alignment of the optics. To help with

this, we have included a special “collimation cap” you can

use. In addition, the primary mirror is center-marked with an

adhesive ring label to aid in collimation.

To check alignment of the mirrors, ﬁrst remove any

eyepieces. Make sure the 2”-to-1.25” adapter is installed in

the focuser. Then, place the collimation cap in the focuser

(Figure 15).

Figure 15: To check the alignment of the mirrors, use the included

collimation cap in the focuser.

Look through the small hole in the center of the collimation

cap. The view should look like Figure 16. If it does not, you’ll

need to make some adjustments to the mirrors’ alignment.

Bottom edge

of focuser

drawtube

Reﬂection of

your eye

Edge of

secondary

mirror

Secondary

mirror

holder

Primary

mirror clip

Reﬂection of

secondary mirror holder

Figure 16: If your telescope is properly aligned, the view through the

collimation cap should look like the drawing above.

It is easiest to collimate a telescope during the day with

the telescope pointed toward a blank wall. This will provide

a high-contrast view, making it easier to determine which

adjustments should be made. Use the supplied hex key(s)

to make adjustments. The 8” SSE Dob comes with 2mm

and 2.5mm hex keys. The 10” SSE Dob comes with a single

2mm hex key. For the 8” SSE Dob, you’ll also need to use

the supplied Phillips head screwdriver.

First, adjust the secondary mirror at the front of the telescope

using the 2mm hex key. While making adjustments, we

recommend positioning the tube horizontally. This prevents

anything from falling onto the primary mirror.

1. You should be able to see the reﬂection of the entire

primary mirror centered within the secondary mirror as

shown in Figure 16. If you can’t (like in Figure 17, for

example), use the three socket-head set screws in the

secondary mirror holder to adjust the tilt of the secondary

mirror (Figure 18).

Edge of

secondary

mirror

Reﬂection of

primary mirror

Figure 17: If the reﬂection of the primary mirror is not centered within

the secondary mirror as shown above, you will need to adjust the tilt of

the secondary mirror.

2mm

Hex key

Figure 18: The three socket head set screws in the secondary mirror

holder adjust the tilt of the secondary mirror.

Reﬂection

of primary

mirror

ENGLISH I 15

a. Adjust one set screw at a time. Make only small

adjustments.

b. If one set screw becomes too tight or too loose, make

adjustments to the other set screws to compensate.

2. Continue adjusting the set screws until the primary mirror

appears centered within the secondary mirror (Figure

19). When you are ﬁnished, make sure all three of the set

screws are snug.

Edge of

secondary

mirror

Reﬂection of

primary mirror

Reﬂection of

secondary mirror

Figure 19: Continue making tilt adjustments to the secondary mirror until

the primary mirror reﬂection is centered as shown in the drawing above.

3. Next, adjust the tilt of the primary mirror until the reﬂection

of the secondary mirror is centered within the reﬂection

of the primary mirror.

For the 8” Dobsonian, use the 2.5mm hex key and

Phillips head screwdriver to tilt the primary mirror. There are

three pairs of collimation screws. Each pair works together

to adjust the tilt.

a. Adjust one pair of screws at a time. Start by

loosening one of the screws in the pair and

tightening the other (Figure 20).

Figure 20: For the 8” Dob, there are three sets of push-pull screws

in the mirror cell that adjust the tilt of the primary mirror. Loosen one

screw in the pair and tighten the other to adjust the tilt.

b. If the mirror tilts opposite the desired direction,

loosen the screw that you previously tightened,

and tighten the other screw in the pair.

c. Once you have adjusted one pair of screws as

much as you can, move onto another pair of screws.

d. Continue adjusting until the reﬂection of the

secondary mirror is centered within the reﬂection

of the primary mirror. When you are ﬁnished, the

view through the collimation cap should look like

Figure 16.

16 I ENGLISH

For the 10” Dobsonian, you won’t need any tools

to tilt the primary mirror. Instead, simply adjust the

thumbscrews. Three of the thumbscrews are locking

screws, while the other three thumbscrews adjust the

tilt.

a. Start by loosening all three of the locking

thumbscrews (Figure 21).

Figure 21: For the 10” Dob, there are three spring-loaded collimation

thumbscrews that adjust the tilt of the primary mirror. The other three

thumbscrews lock the mirror in place once tilt adjustments are completed.

b. Adjust the collimation thumbscrews one at a time.

Each collimation thumbscrew is spring-loaded, so

you can rotate it clockwise or counterclockwise.

c. Continue adjusting the screws until the reﬂection

of the secondary mirror is centered within the

reﬂection of the primary mirror.

d. Re-tighten the three locking thumbscrews until

snug.

e. When you are ﬁnished, the view through the

collimation cap should look like Figure 16.

Your telescope’s optics are now aligned and ready for use.

You can also conﬁrm a telescope’s alignment at night by

pointing the telescope at a bright star at high magniﬁcation.

Center the star in the ﬁeld of view and slightly defocus the

star—it should appear like a circle with a hole in the middle.

(The “hole” is the shadow from the secondary mirror.) If the

hole is not centered within the circle, you’ll need to make

additional adjustments to collimation (Figure 22).

GOOD COLLIMATION NEEDS ADJUSTMENT

Figure 22: You can check collimation by defocusing a bright star centered

in the ﬁeld of view and checking to see if the “hole” is centered. If it is not

centered, some adjustment is needed.

TRANSPORTING

Transporting the StarSense Explorer Dobsonian is

easy, especially considering its size. First, remove the

telescope tube from the base by loosening the altitude

tensioning knob and lifting the telescope tube. You can

carry the tube and the base separately by their integrated

carry handles. The handles are positioned to balance the

load, so neither component should be awkward to carry.

LOCKING

THUMBSCREWS

ENGLISH I 17

CARE AND MAINTENANCE

Store the telescope indoors in a dry place. A garage is

ideal; it will keep the optics near the ambient outdoor

temperature so the optics won’t take as long to acclimate.

Keep the dust cover on the front of the telescope and the

cover cap on the focuser when the telescope is not in

use. Otherwise, dust and particles can accumulate on

the optics.

If the telescope is wet from dew, dry the exterior of the

telescope tube and base with a towel prior to storage.

While a small amount of water on the exterior of the

tube and base won’t harm the telescope, storing it wet

long-term could cause corrosion or water damage. The

wooden base has sealed melamine surfaces. Still, water

can seep into cracks if left wet during storage.

It is normal for some dust and particles to accumulate on

the primary mirror over time. They will not have any effect

on optical performance. However, if the primary mirror

gets excessively dirty, you should clean it.

To clean the primary mirror:

1. Remove the primary mirror cell from the telescope

tube by removing the screws on the tube just above

the mirror cell (Figure 23). You’ll need the Phillips

head screwdriver to do this.

2. Carefully pull the mirror cell off of the tube.

3. The mirror surface is now exposed for cleaning.

We recommend leaving the primary mirror in its cell

during cleaning.

4. Use a blower bulb and optics cleaning brush to

remove larger particles and dust. In some instances,

this will be all the cleaning necessary.

Figure 23: To remove the primary mirror from the telescope tube for

cleaning, ﬁrst remove the screws located just above the mirror cell.

5. To remove marks and oils, use lens cleaning ﬂuid

and lens cleaning tissue to clean the mirror surface.

Apply the ﬂuid to the tissue and gently wipe the

mirror surface. Use radial strokes (i.e. from the

center of the mirror to the edge). Use a new tissue

for every wipe. Avoid rubbing; this typically just

spreads oils around instead of removing them.

6. Once the mirror is clean, reinstall the mirror cell

into the telescope tube and replace the screws.

The secondary mirror will not get dirty often, as its optical

surface is pointed downward. However, if it does require

cleaning, it can be cleaned in the same manner as the

primary mirror. You do not need to remove the secondary

mirror from the telescope to clean it. Point the telescope

horizontally during cleaning to prevent anything from

falling onto the primary mirror.

You may clean the exposed optical surfaces of your

eyepieces in the same manner described above.

18 I ENGLISH

#22470 StarSense Explorer 8” Dobsonian

Optical Design Newtonian reﬂector

Aperture 8” (203mm)

Focal Length 1200mm

Focal Ratio F/5.9

Optical Coatings XLT reﬂective coatings with silicon dioxide and tantalum pentoxide protective

overcoatings for primary and secondary mirrors

Mirror Material Pyrex equivalent for primary and secondary mirrors

Primary mirror thickness 25mm (approx. 1:8 thickness ratio)

Secondary mirror thickness 8.5mm

Minor axis of secondary mirror 47mm

Tube material Steel

Focuser 2” Crayford, includes 2” extension tube and 2”-to-1.25” adapter

Eyepiece / Magniﬁcation 25mm Plössl, 48x

Finderscope StarPointer red-dot ﬁnderscope

Other Accessories StarSense Explorer dock, eyepiece rack, collimation cap,

carry handles for OTA and base, pointing knob, dust covers

Tripod Altazimuth Dobsonian base, adjustable altitude tensioning

Optical Tube Dimensions 44” x 9.5” diameter

Optical Tube Weight 20.6 lbs.

Base dimensions 27” x 19” x 19”

Base weight 22.8 lbs.

Total Telescope Kit Weight 43.4 lbs.

SPECIFICATIONS

ENGLISH I 19

#22471 StarSense Explorer 10” Dobsonian

Optical Design Newtonian reﬂector

Aperture 10” (254mm)

Focal Length 1200mm

Focal Ratio F/4.7

Optical Coatings XLT reﬂective coatings with silicon dioxide and tantalum pentoxide protective

overcoatings for primary and secondary mirrors

Mirror Material Pyrex equivalent for primary and secondary mirrors

Primary mirror thickness 30mm (approx. 1:8.5 thickness ratio)

Secondary mirror thickness 11.5mm

Minor axis of secondary mirror 64mm

Tube material Steel

Focuser 2” Crayford, includes 2” extension tube and 2”-to-1.25” adapter

Eyepiece / Magniﬁcation 25mm Plössl, 48x

Finderscope StarPointer red-dot ﬁnderscope

Other Accessories StarSense Explorer dock, eyepiece rack, collimation cap,

carry handles for OTA and base, pointing knob, dust covers

Tripod Altazimuth Dobsonian base, adjustable altitude tensioning

Optical Tube Dimensions 44” x 11.5” diameter

Optical Tube Weight 29.2 lbs.

Base dimensions 26.5” x 21” x 21”

Base weight 25.6 lbs.

Total Telescope Kit Weight 54.8 lbs.

SPECIFICATIONS

20 I ENGLISH

• Never look directly at the Sun with the naked eye or with a telescope (unless you have the proper solar ﬁlter). Perma-

nent 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 tele-

scope 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 de-

vices to crack or break, allowing unﬁltered sunlight to pass through to the eye.

• Never leave the telescope unsupervised. Make sure an adult who is familiar with the correct operating procedures is with

your telescope at all times, especially when children are present.

SOLAR WARNING

Need assistance?

Contact Celestron Technical Support by visiting

2835 Columbia Street • Torrance, CA 90503 U.S.A.

celestron.com

This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) This device may not cause harmful interference, and (2) this device must accept any interference received, including interference that may cause

undesired operation.

CAUTION: Changes or modiﬁcations not expressly approved by the party responsible for compliance could void the user’s authority to operate the equipment.

NOTE: This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.

This equipment generates, uses and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications. However, there is no guarantee that interference will not occur

in a particular installation.

If this equipment does cause harmful interference to radio or television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to correct the interference by one or more of the following measures:

• Reorient or relocate the receiving antenna.

• Increase the separation between the equipment and receiver.

• Connect the equipment into an outlet on a circuit different from that to which the receiver is connected.

• Consult the dealer or an experienced radio/TV technician for help.

Product design and speciﬁcations are subject to change without prior notiﬁcation. This product is designed and intended for use by those 14 years of age and older.

celestron.com/pages/warranty

WARNING: KEEP BATTERIES OUT OF REACH OF CHILDREN.

• Examine devices and make sure the battery compartment is correctly secured, e.g. that the

screw or other mechanical fastener is tightened.

• Do not use if compartment is not secure.

• Dispose of used button batteries immediately and safely. Flat batteries can still be dangerous.

• Tell others about the risk associated with button batteries and how to keep their children safe.

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