Advanced Series Advanced Series GT INSTRUCTION MANUAL C5-S ● C8-S ● C9.
INTRODUCTION ....................................................................................................................................................................................................4 Warning .................................................................................................................................................................................................................4 ASSEMBLY .........................................................................
Get Alt-Az .................................................................................................................................................................................................28 Goto Alt-Az ...............................................................................................................................................................................................28 Hibernate..........................................................................................
Congratulations on your purchase of the Celestron Advanced Series telescope (AST)! The Advanced Series of telescopes come in standard (non-computerized) and computerized GT models. The Advanced Series is made of the highest quality materials to ensure stability and durability. All this adds up to a telescope that gives you a lifetime of pleasure with a minimal amount of maintenance. Furthermore, your Celestron telescope is versatile — it will grow as your interest grows.
Figure 2.
Figure 2.2 – Advanced Series GT (Advanced C8-SGT Shown) 1 2 12 3 11 15 4 10 14 A 9 5 8 13 B C 6 E 7 D 1 2 3 4 5 6 7 8 A B Optical Tube Finderscope Finderscope Bracket Equatorial Mount Latitude Adjustment Scale Tripod Center Leg Brace/Accessory Tray Tripod Counterweight(s) CONTROL PANEL Hand Control Port DEC Motor Port 6 9 10 11 12 13 14 15 Counterweight Bar Declination Setting Circle Dovetail Mounting Bar Schmidt Corrector Lens Hand Control R.A.
This section covers the assembly instructions for your Celestron Advanced Series Telescope (AST). Your AST telescope should be set up indoor the first time so that it is easy to identify the various parts and familiarize yourself with the correct assembly procedure before attempting it outdoor. #11071 / 11072 C5-S #11025 / 11026 C8-S #11045 / 11046 C9.25-S Diameter 127mm (5") Schmidt-Cassegrain 203mm (8") Schmidt-Cassegrain 235mm (9.
Attaching the Equatorial Mount The equatorial mount allows you to tilt the telescope’s axis of rotation so that you can track the stars as they move across the sky. The CG-5 mount is a German equatorial mount that attaches to the tripod head. On one side of the tripod head there is a metal alignment peg for aligning the mount. This side of the tripod will face north when setting up for an astronomical observing session. To attach the equatorial head: 1.
Installing the Counterweight Depending on which AST telescope you have, you will receive either one or two counterweights. To install the counterweight(s): 1. 2. Orient the mount so that the counterweight bar points toward the ground . Remove the counterweight safety screw on the end of the counterweight bar (i.e., opposite the end that attaches to the mount). Counterweight Bar Locking Screw 3. Loosen the locking screw on the side of the counterweight. 4.
The knob is a tension fit, so sliding it on holds it in place. As mentioned above, there are two R.A. shafts, one on either side of the mount. It makes no difference which shaft you use since both work the same. Use whichever one you find more convenient. If, after a few observing sessions, you find the R.A. slow motion knob is more accessible from the other side, pull firmly to remove the knob, then install it on the opposite side. 5. The DEC slow motion knob attaches in the same manner as the R.A. knob.
3. Hold the visual back with the set screw in a convenient position and rotate the knurled slip ring clockwise until tight. Once this is done, you are ready to attach other accessories, such as eyepieces, diagonal prisms, etc. If you want to remove the visual back, rotate the slip ring counterclockwise until it is free of the rear cell. Installing the Star Diagonal The star diagonal is a prism that diverts the light at a right angle to the light path of the telescope.
• Finderscope • Finder Bracket • Rubber O-ring • Three Nylon Tipped Thumbscrews (10-24x1/2") • Two Phillips Head Screws (8-32x1/2") To install the finderscope: 1. 2. Attach the bracket to the optical tube. To do this, place the curved portion of the bracket with the slot over the two holes in the rear cell. The bracket should be oriented so that the rings that hold the finder are over the telescope tube, not the rear cell (see Fig 2-11).
Moving the Telescope Manually In order to properly balance your telescope, you will need to move your telescope manually at various portions of the sky to observe different objects. To make rough adjustments, loosen the R.A. and DEC clutch knobs slightly and move the telescope in the desired direction. Both the R.A. and DEC axis have lock levers to clutch down each axis of the telescope. To loosen the clutches on the telescope, rotate the lock levers counterclockwise. Balancing The Mount in R.A.
Balancing The Mount in DEC Although the telescope does not track in declination, the telescope should also be balanced in this axis to prevent any sudden motions when the DEC lock lever is loose. To balance the telescope in DEC: 1. Loosen the R.A. clutch lock lever and rotate the telescope so that it is on one side of the mount (i.e., as described in the previous section on “Balancing the Mount in R.A.”). 2. Tighten the R.A. lock lever to hold the telescope in place. 3.
For Advanced GT users, it may be helpful to remove the front latitude adjustment screw completely. This will allow the mount to reach lower latitudes without the screw coming into contact with the R.A. motor assembly. To remove the latitude screw, first use the rear screw to raise the mount head all the way up. Then remove the front latitude screw completely. Now you should be able to manually move the mount head all the way to its lowest latitude.
The Advanced Series GT, computerized version of each telescope has a hand controller designed to give you instant access to all the functions that your telescope has to offer. With automatic slewing to over 40,000 objects, and common sense menu descriptions, even a beginner can master its variety of features in just a few observing sessions. Below is a brief description of the individual components of the computerized hand controller: 1. 2. 3.
4. Catalog Keys: The Advanced Series has keys on the hand control to allow direct access to each of the catalogs in its database. The hand control contains the following catalogs in its database: Messier – Complete list of all Messier objects. NGC – Complete list of all the deep-sky objects in the Revised New General Catalog. Caldwell – A combination of the best NGC and IC objects. Planets - All 8 planets in our Solar System plus the Moon.
Alignment Procedures In order for the telescope to accurately point to objects in the sky, it must first be aligned to three known positions (stars) in the sky. With this information, the telescope can create a model of the sky, which it uses to locate any object with known coordinates.
4. Select one of the four alignment methods as described below. Note: If incorrect information is entered into the hand control, the UNDO button acts like a back space button allowing the user to re-enter the correct data. Auto Align Auto Align allows the telescope to automatically choose three stars (two on one side of the Meridian, and one on the opposite side) on which to align itself. To Auto Align your telescope: 1. Select Auto Align from the alignment choices given.
4. As with the Auto Align procedure, you will be asked to center the star in the crosshairs of the finderscope and then center the star in the eyepiece, pressing ENTER when complete. NOTE: Although the telescope allows the user to select the alignment stars, for best all-sky pointing accuracy it is still necessary to select two alignment stars on one side of the Meridian and the third star on the opposite side of the Meridian.
Object Catalog Selecting an Object Now that the telescope is properly aligned, you can choose an object from any of the catalogs in the telescope's extensive database. The hand control has a key (4) designated for each of the catalogs in its database. There are two ways to select objects from the database: scrolling through the named object lists and entering object numbers. Helpful Hint Pressing the LIST key on the hand control will access all objects in the database that have common names or types.
Tour Mode The Advanced Series telescopes include a tour feature which automatically allows the user to choose from a list of interesting objects based on the date and time in which you are observing. The automatic tour will display only those objects that are within your set filter limits (see Filter Limits in the Setup Procedures section of the manual). To activate the Tour mode, press the TOUR key (6) on the hand control.
1 2 3 4 5 = = = = = .5x 1x (sidereal) 4x 8x 16x 6 7 8 9 = 64x = .5º / sec = 2º / sec = 3º / sec Nine available slew speeds Setup Procedures The Advanced GT contains many user defined setup functions designed to give the user control over the telescope's many advanced features.
GoTo Object: To go to any of the user defined objects stored in the database, scroll down to either GoTo Sky Obj or Goto Land Obj and enter the number of the object you wish to select and press ENTER. The telescope will automatically retrieve and display the coordinates before slewing to the object. Save Sky Object: Your telescope stores celestial objects to its database by saving its right ascension and declination in the sky. This way the same object can be found each time the telescope is aligned.
Precise GoTo The Advanced Series telescopes have a precise goto function that can assist in finding extremely faint objects and centering objects closer to the center of the field of view for astrophotography and CCD imaging. Precise Goto automatically searches out the closest bright star to the desired object and asks the user to carefully center it in the eyepiece. The hand control then calculates the small difference between its goto position and its centered position.
minimum altitude limit to read +20º. This will make sure that the hand control only displays objects that are higher in altitude than 20º. Observing Tip! If you want to explore the entire object database, set the maximum altitude limit to 90º and the minimum limit to – 90º. This will display every object in the database lists regardless of whether it is visible in the sky from your location.
telescopes azimuth in this position (by looking at Get Alt-Az under the Utilities menu) you can determine the telescopes azimuth at its most extended position. Enter this azimuth reading for either the maximum or minimum azimuth slew limit to ensure that the telescope will not slew beyond this point.
Light Control – This feature allows you to turn off both the red key pad light and LCD display for daytime use to conserve power and to help preserve your night vision. Factory Settings – Returns the Advanced GT hand control to its original factory settings. Parameters such as backlash compensation values, initial date and time, longitude/latitude along with slew and filter limits will be reset. However, stored parameters such as user defined objects will remain saved even when Factory Settings is selected.
ADVANCED GT MENU TRACKING MODE EQ NORTH EQ SOUTH OFF RATE SIDEREAL SOLAR LUNAR VIEW TIME-SITE SCOPE SETUP SETUP TIME-SITE ANTI-BACKLASH FILTER LIMITS DIRECTION BUTTONS GOTO APPROACH AUTOGUIDE RATE AZIMUTH LIMITS EAST/WEST FILTERING UTILITIES CALIBRATE GOTO HOME POSITION POLAR ALIGN LIGHT CONTROL FACTORY SETTING VERSION GET ALT-AZ GOTO ALT-AZ HIBERNATE TURN ON/OFF GPS USER OBJECTS ALIGNMENT LIST START-UP PROCUDURE SET TO INDEX ENTER TIME DLS/ST TIME ZONE ENTER DATE- MM/DD/YY ENTER LONG/LAT AUTO ALIGN CENT
A telescope is an instrument that collects and focuses light. The nature of the optical design determines how the light is focused. Some telescopes, known as refractors, use lenses. Other telescopes, known as reflectors, use mirrors. The Schmidt-Cassegrain optical system (or Schmidt-Cass for short) uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope.
Focusing The Schmidt-Cassegrain focusing mechanism controls the primary mirror which is mounted on a ring that slides back and forth on the primary baffle tube. The focusing knob, which moves the primary mirror, is on the rear cell of the telescope just below the star diagonal and eyepiece. Turn the focusing knob until the image is sharp. If the knob will not turn, it has reached the end of its travel on the focusing mechanism. Turn the knob in the opposite direction until the image is sharp.
Let’s say, for example, you are using the 40mm Plossl eyepiece. To determine the magnification you simply divide the focal length of your telescope (the C8-S for example has a focal length of 2032mm) by the focal length of the eyepiece, 40mm. Dividing 2032 by 40 yields a magnification of 51 power. Although the power is variable, each instrument under average skies has a limit to the highest useful magnification. The general rule is that 60 power can be used for every inch of aperture.
Up to this point, this manual covered the assembly and basic operation of your telescope. However, to understand your telescope more thoroughly, you need to know a little about the night sky. This section deals with observational astronomy in general and includes information on the night sky and polar alignment. The Celestial Coordinate System To help find objects in the sky, astronomers use a celestial coordinate system that is similar to our geographical coordinate system here on Earth.
Motion of the Stars The daily motion of the Sun across the sky is familiar to even the most casual observer. This daily trek is not the Sun moving as early astronomers thought, but the result of the Earth's rotation. The Earth's rotation also causes the stars to do the same, scribing out a large circle as the Earth completes one rotation. The size of the circular path a star follows depends on where it is in the sky.
Latitude Scales The easiest way to polar align a telescope is with a latitude scale. Unlike other methods that require you to find the celestial pole by identifying certain stars near it, this method works off of a known constant to determine how high the polar axis should be pointed. The Advanced Series mount can be adjusted from 30 to 60 degrees (see figure 5-3).
4. Center Polaris in the field of the telescope using the fine adjustment controls on the mount. Remember, while Polar aligning, do NOT move the telescope in R.A. or DEC. You do not want to move the telescope itself, but the polar axis. The telescope is used simply to see where the polar axis is pointing. Like the previous method, this gets you close to the pole but not directly on it. The following methods help improve your accuracy for more serious observations and photography.
Declination Drift Method of Polar Alignment This method of polar alignment allows you to get the most accurate alignment on the celestial pole and is required if you want to do long exposure deep-sky astrophotography through the telescope. The declination drift method requires that you monitor the drift of selected stars. The drift of each star tells you how far away the polar axis is pointing from the true celestial pole and in what direction.
With your telescope set up, you are ready to use it for observing. This section covers visual observing hints for both solar system and deep sky objects as well as general observing conditions which will affect your ability to observe. Observing the Moon Often, it is tempting to look at the Moon when it is full. At this time, the face we see is fully illuminated and its light can be overpowering. In addition, little or no contrast can be seen during this phase.
Never project an image of the Sun through the telescope. Because of the folded optical design, tremendous heat buildup will result inside the optical tube. This can damage the telescope and/or any accessories attached to the telescope. For safe solar viewing, use a solar filter that reduces the intensity of the Sun's light, making it safe to view. With a filter you can see sunspots as they move across the solar disk and faculae, which are bright patches seen near the Sun's edge.
rays from the same object arrive slightly displaced creating an imperfect or smeared image. These atmospheric disturbances vary from time-to-time and place-to-place. The size of the air parcels compared to your aperture determines the "seeing" quality. Under good seeing conditions, fine detail is visible on the brighter planets like Jupiter and Mars, and stars are pinpoint images. Under poor seeing conditions, images are blurred and stars appear as blobs.
After looking at the night sky for a while you may want to try photographing it. Several forms of celestial photography are possible with your telescope, including short exposure prime focus, eyepiece projection, long exposure deep sky, terrestrial and even CCD imaging. Each of these is discussed in moderate detail with enough information to get you started. Topics include the accessories required and some simple techniques.
• • • • T-Max 400 Any 100 to 400 ISO color slide film Fuji Super HG 400 Ektar 25 or 100 2. Center the Moon in the field of your telescope. 3. Focus the telescope by turning the focus knob until the image is sharp. 4. Set the shutter speed to the appropriate setting (see table below). 5. Trip the shutter using a cable release. 6. Advance the film and repeat the process.
act as a shutter. The card prevents light from entering the telescope while the shutter is released. Once the shutter has been released and the vibration has diminished (a few seconds), move the black card out of the way to expose the film. After the exposure is complete, place the card over the front of the telescope and close the shutter. Advance the film and you're ready for your next shot. Keep in mind that the card should be held a few inches in front of the telescope, and not touching it.
There are several techniques for this type of photography, and the one chosen will determine the standard accessories needed. The best method for long exposure deep sky astrophotography is with an off-axis guider. This device allows you to photograph and guide through the telescope simultaneously. Celestron offers a very special and advanced offaxis guider, called the Radial Guider (#94176). In addition, you will need a T-Ring to attach your camera to the Radial Guider.
There is no exposure determination table to help you get started. The best way to determine exposure length is look at previously published photos to see what film/exposure combinations were used. Or take unguided sample photos of various parts of the sky while the drive is running. Always take exposures of various lengths to determine the best exposure time. Terrestrial Photography Your telescope makes an excellent telephoto lens for terrestrial (land) photography.
Focal Length & Speed Telescope Model Standard Cassegrain f/10 With Reducer/Corrector f/6.3 C5-S 49" (1250mm) 31" (788mm) C8-S 80" (2032mm) 50.4" (1280mm) C9.25-S 93" (2350mm) 58" (1481mm) C5-S 13 x 10 (arc 20.5 x 15.7 (arc min) min) ST 237 C8-S 8 x 6.1 (arc 12.6 x 9.7 (arc min) F.O.V.* min) C9.25-S 6.9 x 5.3 (arc 11 x 8.4 (arc min) min) * Field of view calculated using SBIG ST 237 CCD camera with 4.7mm x 3.6mm chip.
While your telescope requires little maintenance, there are a few things to remember that will ensure your telescope performs at its best. Care and Cleaning of the Optics Occasionally, dust and/or moisture may build up on the corrector plate of your telescope. Special care should be taken when cleaning any instrument so as not to damage the optics. If dust has built up on the corrector plate, remove it with a brush (made of camel’s hair) or a can of pressurized air.
Figure 8-2 -- Even though the star pattern appears the same on both sides of focus, they are asymmetric. The dark obstruction is skewed off to the left side of the diffraction pattern indicating poor collimation. To accomplish this, you need to tighten the secondary collimation screw(s) that move the star across the field toward the direction of the skewed light. These screws are located in the secondary mirror holder (see figure 8-1).
You will find that additional accessories enhance your viewing pleasure and expand the usefulness of your telescope. For ease of reference, all the accessories are listed in alphabetical order. Adapter AC (#18773) - Allow DC (battery powered) telescopes to be converted for use with 120 volt AC power. Auxiliary Port Accessory (#93965) – This accessory plugs into the auxiliary port of the telescopes control panel to provide additional ports for accessories like the CN-16 GPS as well as a PC programming port.
Series 2 – #94119-20 Deep Yellow, Red, Light Green, ND25% T (#s 12, 25, 56, 96ND-25) Series 3 – #94119-30 Light Red, Blue, Green, ND50% T (#s 23A, 38A, 58, 96ND-50) Series 4 – #94119-40 Yellow, Deep Yellow, Violet, Pale Blue (#s 8, 47, 82A, ND96-13) Flashlight, Night Vision - (#93588) - Celestron’s premium model for astronomy, using two red LED's to preserve night vision better than red filters or other devices. Brightness is adjustable. Operates on a single 9 volt battery (included).
Radial Guider (#94176) - The Celestron Radial Guider® is specifically designed for use in prime focus, deep sky astrophotography and takes the place of the T-Adapter. This device allows you to photograph and guide simultaneously through the optical tube assembly of your telescope. This type of guiding produces the best results since what you see through the guiding eyepiece is exactly reproduced on the processed film.
Appendix A – Technical Specifications Advanced Series 11071/11072 C5-S 11025/11026 C8-S 11045/11046 C9.25-S 127mm(5") Schmidt-Cassegrain 1250mm F/10 6x30 CG-5 Equatorial 25mm Plossl (50x) 1.25" Yes 2" Stainless Steel 203mm (8") Schmidt-Cassegrain 2032mm F/10 6x30 CG-5 Equatorial 25mm Plossl (81x) 1.25" Yes 2" Stainless Steel 235mm (9.25") Schmidt-Cassegrain 2350mm F/10 6x30 CG-5 Equatorial 25mm Plossl (94x) 1.25" Yes 2" Stainless Steel 300x 18x 13 1.1arc seconds .
Appendix B - Glossary of Terms AAbsolute magnitude Airy disk Alt-Azimuth Mounting Altitude Aperture Apparent Magnitude Arcminute Arcsecond Asterism Asteroid Astrology Astronomical unit (AU) Aurora Azimuth BBinary Stars CCelestial Equator Celestial pole Celestial Sphere Collimation DDeclination (DEC) EEcliptic Equatorial mount FFocal length The apparent magnitude that a star would have if it were observed from a standard distance of 10 parsecs, or 32.6 light-years. The absolute magnitude of the Sun is 4.
JJovian Planets KKuiper Belt LLight-Year (LY) MMagnitude Meridian Messier NNebula North Celestial Pole Nova OOpen Cluster PParallax Parfocal Parsec Point Source RReflector Resolution Right Ascension: (RA) SSchmidt Telescope Sidereal Rate Any of the four gas giant planets that are at a greater distance form the sun than the terrestrial planets. A region beyond the orbit of Neptune extending to about 1000 AU which is a source of many short period comets.
telescope at this rate. The rate is 15 arc seconds per second or 15 degrees per hour. TTerminator UUniverse VVariable Star WWaning Moon The boundary line between the light and dark portion of the moon or a planet. The totality of astronomical things, events, relations and energies capable of being described objectively. A star whose brightness varies over time due to either inherent properties of the star or something eclipsing or obscuring the brightness of the star.
APPENDIX C LONGITUDES AND LATITUDES LONGITUDE degrees min ALABAMA Anniston Auburn Birmingham Centreville Dothan Fort Rucker Gadsden Huntsville Maxwell AFB Mobile Mobile Aeros Montgomery Muscle Shoal Selma Troy Tuscaloosa ALASKA Anchorage Barrow Fairbanks Haines Hrbor Homer Juneau Ketchikan Kodiak Nome Sitka Sitkinak Skagway Valdez ARIZONA Davis-M AFB Deer Valley Douglas Falcon Fld Flagstaff Fort Huachuc Gila Bend Goodyear GrandCanyon Kingman Luke Page Payson Phoenix Prescott Safford Awrs Scottsdale Show Low
Melbourne Miami Naples Nasa Shuttle Orlando Panama City Patrick AFB Pensacola Ruskin Saint Peters Sanford Sarasota Tallahassee Tampa Intl Titusville Tyndall AFB Vero Beach West Palm Beach Whiting Fld GEORGIA Albany Alma Athens Atlanta Augusta/Bush Brunswick Columbus Dobbins AFB Fort Benning Ft Stewart Hunter Aaf La Grange Macon/Lewis Moody AFB Robins AFB Rome/Russell Valdosta Waycross HAWAII Barbers Pt Barking San Fr Frigate Hilo Honolulu Int Kahului Maui Kaneohe Mca Kilauea Pt Lanai-Lanai Lihue-Kauai Maui
Wurtsmith Ypsilanti MINNESOTA Albert Lea Alexandria Bemidji Muni Brainerd-Crw Detroit Laks Duluth Ely Fairmont Fergus Falls Grand Rapids Hibbing Intl Falls Litchfield Mankato Marshall Arpt Minneapolis Park Rapids Pequot Lake Rochester Saint Paul St Cloud Thief River Tofte Warroad Worthington MISSISSIPPI Columbus AFB Golden Trian Greenville Greenwood Gulfport Hattiesburg Jackson Keesler AFB Laurel Mccomb Meridian NAS Meridian/Key Natchez Oxford Tupelo MISSOURI Columbia Cape Girardeau Ft Leonard Jefferson Cit
LONGITUDE degrees OKLAHOMA Altus AFB 99 Ardmore 97 Bartlesville 96 Clinton 99 Enid 97 Fort Sill 98 Gage 99 Hobart 99 Lawton 98 Mcalester 95 Norman 97 Oklahoma 97 Page 94 Ponca City 97 Stillwater 97 Tinker AFB 97 Tulsa 95 Vance AFB 97 OREGON Astoria 123 Aurora 122 Baker 117 Brookings 124 Burns Arpt 118 Cape Blanco 124 Cascade 121 Corvallis 123 Eugene 123 Hillsboro 122 Klamath Fall 121 La Grande 118 Lake View 120 Meacham 118 Medford 122 Newport 124 North Bend 124 Ontario 117 Pendleton 118 Portland 122 Redmond
LONGITUDE LATITUDE degrees min degrees Walla Walla 118 16.8 46 Wenatchee 120 1.2 47 Whidbey Is 122 39 48 Yakima 120 31.8 46 WEST VIRGINIA Beckley 81 7.2 37 Bluefield 81 13.2 37 Charleston 81 3.6 38 Clarksburg 80 13.8 39 Elkins 79 51 38 Huntington 82 33 38 Lewisburg 80 2.4 37 Martinsburg 77 58.8 39 Morgantown 79 55.2 39 Parkersburg 81 25.8 39 Wheeling 80 39 40 Wh Sulphur 80 1.2 37 LONGITUDE degrees min min 6 24 21 34.
Appendix D - RS-232 Connection You can control your telescope with a computer via the RS-232 port on the computerized hand control and using an optional RS-232 cable (#93920). Once connected, the telescope can be controlled using popular astronomy software programs. Communication Protocol: The Advanced GT communicates at 9600 bits/sec, No parity and a stop bit. All angles are communicated with 16 bit angle and communicated using ASCII hexadecimal.
Additional RS232 Commands Send Any Track Rate Through RS232 To The Hand Control 1. 2. 3. 4. Multiply the desired tracking rate (arcseconds/second) by 4. Example: if the desired trackrate is 150 arcseconds/second, then TRACKRATE = 600 Separate TRACKRATE into two bytes, such that (TRACKRATE = TrackRateHigh*256 + rackRateLow). Example: TrackRateHigh = 2 TrackRateLow = 88 To send a tracking rate, send the following 8 bytes: a. Positive Azm tracking: 80, 3, 16, 6, TrackRateHigh, TrackRateLow, 0, 0 b.
APPENDIX E – MAPS OF TIME ZONES 63
CELESTRON TWO YEAR WARRANTY A. Celestron warrants this telescope 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.
Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. (310) 328-9560 Fax. (310) 212-5835 Web site at http//www.celestron.com Copyright 2003 Celestron All rights reserved. (Products or instructions may change without notice or obligation.) Item # 11025-INST $10.