Celestron 91012 Instruction Manual

Celestron 7” Maksutov-Cassegrain Telescope Tube

INSTRUCTION MANUAL

Model #91012

ENGLISH

WHAT’S IN THE BOX

We recommend saving your telescope box so it can be used 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

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1. Maksutov-Cassegrain Telescope Tube

2. 8x50 Straight Through Finderscope

3. Finderscope Bracket

4. 28mm Eyepiece (2”)

5. 2” 90° Star Diagonal

6. 2” Visual Back

7. CGE Style Dovetail Bar

7

SOLAR WARNING

• 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, especially when children or adults unfamiliar with the correct operating procedures of your telescope are present.

INSTALLING THE FINDERSCOPE

1. Loosen the two finderscope adjustment screws so they don’t protrude
into the bracket.

2. Slide the rubber O-ring over the eyepiece end of the finderscope and
roll it 2/3 of the way up until it sits in the groove in the finderscope body.

3. Insert the eyepiece end of the finderscope through the narrow part of
the bracket until the O-ring presses tightly between the finder and the
inside of the bracket. Once it stops, then pull outward on the spring
loaded adjustment screw and continue inserting the finderscope until it
is approximately centered in the bracket.

4. Tighten the two adjustment screws until they make contact with the
finderscope body.

5. Locate the finderscope dovetail mounting bracket on the top left side
of the telescope’s rear cell and loosen the set screw until it is not
protruding into the dovetail receptacle.

6. Slide the finderscope and bracket all the way into the dovetail mounting
bracket on the telescope and tighten the set screw on the mounting
bracket to hold the finderscope in place.

INSTALLING THE VISUAL BACK

The visual back is an accessory that adapts the telescope to accept 2”
visual accessories. To install the visual back:

1. Remove the cap on the telescope’s rear cell and thread the knurled
slip ring on the visual back over the threads on the rear cell.

2. Hold the body of the visual back with the set screw in your desired
position and rotate the knurled slip ring clockwise until it is tight.

3. If you want to remove the visual back, rotate the slip ring counterclockwise
until it is free of the rear cell.

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INSTALLING THE STAR DIAGONAL

The star diagonal is a prism that diverts the light at a right angle to a more
convenient viewing angle. To install the star diagonal:

1. Turn the set screw on the visual back until its tip no longer extends
into the inner diameter of the visual back.

2. Slide the chrome portion of the star diagonal into the visual back.

3. Tighten the set screw on the visual back to hold the star diagonal in place.

If you wish to change the orientation of the star diagonal, loosen the set
screw on the visual back until the star diagonal rotates freely. Rotate the
diagonal to the desired position and tighten the set screw.

INSTALLING THE EYEPIECE

The eyepiece is an optical element that magnifies the image focused by
the telescope. Without the eyepiece, it would be impossible to use the
telescope visually. To attach an eyepiece to the telescope:

1. Loosen the set screw on the star diagonal so that it does not obstruct
the inner diameter of the star diagonal.

2. Slide the chrome barrel of the eyepiece into the star diagonal.

3. Tighten the set screw on the star diagonal to secure the eyepiece

in place.

FOCUSING THE TELESCOPE

The focus knob is located just to the right of the visual back. To focus
the telescope, simply turn the knob left or right until the image appears
sharp. The focusing mechanism is very fine and it can take quite a few
turns of the focus knob to go through the entire range of focus. The first
time you focus on a distant target, turn the knob slowly and work from one
stop to the other.

Focus Knob

ALIGNING THE FINDERSCOPE

The 8x50 finderscope helps you aim your telescope by looking through it and covering your target with the crosshair reticle. The first time you assemble your
telescope, you will need to align the finderscope with the main optics of the telescope. Although this step can be done at night, it is significantly easier during the
day. Once you have completed the finderscope alignment, you should not have to repeat this step unless the finderscope is bumped or the telescope is dropped.

1. Take the telescope outside during the day. Using your naked eye, find an easily recognizable object, such as a streetlight, car license plate, or tall tree. The object
should be as far away as possible, but at least a quarter mile away.

2. Remove the main dust cover from the telescope and make sure your 28mm eyepiece is installed.

3. Move the telescope left and right or up and down so that it is roughly pointing toward the object you chose in step 1.

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4. Look through the telescope’s eyepiece and manually 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.

5. Look through the eyepiece of the finderscope and locate the crosshair reticle. It will probably be close to, but not on top of, the object you see when you are

looking through the 28mm eyepiece.

6. Without moving the telescope, use the two adjustment knobs on the finderscope bracket so the crosshairs appear over the same object you are observing in

the main telescope.

7. You are now ready to observe. Any target you put the crosshairs on should appear in your eyepiece.

CELESTRON TWO YEAR LIMITED WARRANTY

A. Celestron warrants this product to be free from defects in materials and workmanship for two years. Celestron will repair or replace such product or part thereof

which, upon inspection by Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to repair or replace such
product, the product must be returned to Celestron together with proof-of-purchase satisfactory to Celestron.

B. The Proper Return Authorization Number must be obtained from Celestron in advance of return. Please submit your request to Celestron’s online

technical support center at https://www.celestron.com/pages/technical-support or call [phone] to receive the number to be displayed on the
outside of your shipping container.

All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together with a brief description
of any claimed defects. Parts or product for which replacement is made shall become the property of Celestron.

The customer shall be responsible for all costs of transportation and insurance, both to and from the factory of Celestron, and shall be required to prepay such costs.
Celestron shall use reasonable efforts to repair or replace any product covered by this warranty within thirty days of receipt. In the event repair or replacement shall

require more than thirty days, Celestron shall notify the customer accordingly. Celestron reserves the right to replace any product which has been discontinued from
its product line with a new product of comparable value and function.

This warranty shall be void and of no force of effect in the event a covered product has been modified in design or function, or subjected to abuse, misuse,
mishandling or unauthorized repair. Further, product malfunction or deterioration due to normal wear is not covered by this warranty.

CELESTRON DISCLAIMS ANY WARRANTIES, EXPRESSED OR IMPLIED, WHETHER OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR USE, EXCEPT AS EXPRESSLY SET FORTH HEREIN. THE SOLE
OBLIGATION OF CELESTRON UNDER THIS LIMITED WARRANTY SHALL BE TO REPAIR OR REPLACE THE COVERED PRODUCT, IN ACCORDANCE WITH THE TERMS SET FORTH HEREIN. CELESTRON
EXPRESSLY DISCLAIMS ANY LOST PROFITS, GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE
OR INABILITY TO USE ANY CELESTRON PRODUCT. ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF TWO YEARS FROM
THE DATE OF ORIGINAL RETAIL PURCHASE.

Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above
limitations and exclusions may not apply to you.

This warranty gives you specific legal rights, and you may also have other rights which vary from state to state. Celestron reserves the right to modify or
discontinue, without prior notice to you, any model or style product. If warranty problems arise or if you need assistance in using your product, please visit
Celestron’s online technical support center at https://www.celestron.com/pages/technical-support, or call 1- 800.421.9649.

NOTE: This warranty is valid to U.S.A. and Canadian customers who have purchased this product from an authorized Celestron dealer in the U.S.A. or Canada. Warranty outside the U.S.A. and Canada

is valid only to customers who purchased from a Celestron’s International Distributor or Authorized Celestron Dealer in the specific country. Please contact them for any warranty service.

FCC 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.
Optical tube assembly is not sold separately by Celestron, only as part of a kit.

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.

© 2018 Celestron • All rights reserved • celestron.com
2835 Columbia Street • Torrance, CA 90503 U.S. A.
Telephone: [phone]

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Printed in China

Tube de télescope Maksutov-Cassegrain 7” Celestron

MODE D'EMPLOI

Modèle # 91012

FRANÇAIS

CONTENU DE LA BOÎTE

Nous vous recommandons de conserver la boîte de votre télescope pour ranger votre télescope quand vous ne vous en servez pas. Déballez la boîte avec
soin, car certaines pièces sont petites. Reportez-vous à la liste des pièces pour vous assurer que toutes les pièces et les accessoires sont présents.

LISTE DES PIÈCES

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1. Tube de télescope Maksutov-Cassegrain

2. Chercheur direct 8x50

3. Support de chercheur

4. Oculaire 28mm (2”)

5. Diagonale à 90° 2”

6. Adaptateur d'optique 2”

7. Barre à queue d'aronde style CGE

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AVERTISSEMENT SUR LE SOLEIL

• Ne jamais regarder directement vers le Soleil à l'œil nu ou avec un télescope, à moins que vous n'utilisiez un filtre solaire adéquat. Cela peut causer des lésions oculaires permanentes et irréversibles.

•

N'utilisez jamais votre télescope pour projeter une image du Soleil sur une surface quelconque. Une concentration de chaleur dangereuse peut être générée à l’intérieur et endommager le télescope et les

accessoires attachés.

• Ne jamais utiliser un filtre solaire d'oculaire ou une cale de Herschel. De la chaleur peut se concentrer dans le télescope, risquant d'entraîner des failles ou des cassures sur l’équipement, permettant

à la lumière non filtrée du Soleil d'atteindre les yeux.

• Ne pas laisser le télescope sans surveillance, spécialement en présence d’enfants ou d’adultes qui ne sont pas familiarisés avec les procédures d’utilisation de votre télescope.

INSTALLER LE CHERCHEUR

1. Desserrez les deux vis de réglage du chercheur de manière à ce qu’elles
ne dépassent pas dans le support.

2. Faites glisser le joint de caoutchouc en anneau sur l’extrémité du
chercheur comportant l’oculaire, et faites-le rouler aux deux tiers de la
hauteur, jusqu’à ce qu’il s’insère dans le creux ménagé dans le corps
du chercheur.

3. Insérez l’extrémité de oculaire dans le chercheur au-travers de la partie
étroite du support jusqu’à ce que le joint en anneau soit pressé entre le
chercheur et l’intérieur du support. Lorsqu’il ne peut plus bouger, tirez
sur la vis de réglage à ressort vers l’extérieur, et continuez à insérer le
chercheur jusqu’à ce qu’il soit approximativement centré dans le support.

4. Serrez les deux vis de réglage jusqu’à ce qu’elles entrent en contact
avec le corps du chercheur.

5. Repérez la monture en queue d'aronde situé sur le côté supérieur droit
de la cellule arrière du télescope et déserrez la vis de fixation jusqu’à ce
qu’elle ne dépasse plus dans le réceptacle de queue d'aronde.

6. Faites glisser le chercheur et le support au maximum dans le support de
montage de la queue d'aronde et serrez la vis de fixation sur le support
de montage pour maintenir le chercheur en place.

INSTALLER L’ADAPTATEUR

L’adaptateur est un accessoire qui permet au télescope de recevoir des
accessoires visuels de 2”. Pour installer l’adaptateur :

1. Retirez le cache de la cellule arrière du télescope et vissez l’anneau
coulissant fileté de l’adaptateur sur le pas de vis de la cellule arrière.

2. Fixez le corps de l’adaptateur avec les vis de fixation dans la position
désirée puis faites pivoter l’anneau coulissant fileté dans le sens des
aiguilles d'une montre jusqu’à ce qu’il soit serré.

Si vous souhaitez retirer l’adaptateur, faites pivoter l’anneau coulissant

3.

dans le sens inverse des aiguilles d’une montre jusqu’à ce qu’il soit
libéré de la cellule arrière.

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