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The C8 Optical Tube Assembly • 17

T H E 8 " O P T I C A L T U B E A S S E M B L Y (#11023-1)

The Celestron 8 Optical Tube Assembly (OTA) is simply the telescope without
an equatorial mount and clock drive unit. In its standard configuration, the C8
Optical Tube Assembly is designed to attach to a standard, but very rigid,
photographic tripod for terrestrial viewing. However, this does not mean that
the C8 Optical Tube Assembly can not be used for astronomical viewing. It
can also be used with your own heavy duty German equatorial mount or it can
be used as an altazimuth telescope for casual astronomical observations. The
C8 Optical Tube Assembly (11023-1) is shipped in one carton which contains
the telescope and all standard accessories which include:

• 25mm SMA Ocular 1-1/4"
• Visual Back 1-1/4"
• Star Diagonal 1-1/4"
• 6x30mm Finder and Bracket
• Balance Bracket (for tripod adaption) - Dovetail Slide Bar
• Lens Cap

Figure 3-1

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Содержание The G-8 11023

Страница 1: ...The G 8 Model 11023 8 OPTICAL TUBE ASSEMBLY Model 11023 1 CG 5 EQ Mount Model 91515 INSTRUCTIONMANUAL...

Страница 2: ...Balancing the Telescope in DEC 14 Adjusting the Mount in Altitude 15 Adjusting the Mount in Azimuth 15 DisassemblingandTransportingYourG 8 16 Storing Your G 8 16 THECELESTRON8OPTICALTUBEASSEMBLY 17 Se...

Страница 3: ...etting Circles 39 StarHopping 40 ViewingConditions 42 Transparency 42 Sky Illumination 42 Seeing 42 CELESTIAL PHOTOGRAPHY 44 Short Exposure Prime Focus 45 Piggyback 47 EyepieceProjection 49 Long Expos...

Страница 4: ...telescope that gives you a lifetime of pleasure with a minimal amount of maintenance Furthermore your Celestron C8 is versatile it will grow as your interest grows However your C8 telescope is not li...

Страница 5: ...THISINSTRUMENTHASENOUGHLIGHT GATHERINGPOWERTOCAUSEPERMANENTANDIRREVERSIBLEEYE DAMAGE IN ADDITION THE IMAGE PROJECTED BY THE FINDER IS HOT ENOUGHTOBURNSKINORCLOTHING A telescope is an instrument that...

Страница 6: ...iagram shows the light path of the Schmidt Cassegrain optical system Note that the light rays travel the length of the telescope tube three times making this a compact optical design Note that the cur...

Страница 7: ...ghtBar Two Counterweights 3 6 Kg and 1 8 Kg Declination DEC Slow Motion Knob Right Ascension R A Slow Motion Knob Adjustable Aluminium Tripod Accessory Tray When setting up the telescope find a large...

Страница 8: ...ghts shaft Lock Collar 5 R A Setting Circle 16 DEC Circle 6 Latitude Scale 17 DEC Lock Lever 7 Latitude Adjustment Screw 18 DEC Slow Motion Shaft 8 Azimuth Adjustment Knob 19 Dovetail Slide Bar 9 Trip...

Страница 9: ...et This will help minimize any flexure or wobble of the legs Once the tripod is set up you can adjust the height at which it stands To do this 1 Loosen the knob on the leg clamp so that the tripod leg...

Страница 10: ...and position it so the thread holes in the accessory tray are above the slotted holes in the bracket 3 Insert the wing bolts up through the slotted holes in the bracket see figure 2 3 4 Thread the wi...

Страница 11: ...s straight up To attach the equatorial head 1 Locate the azimuth adjustment screws on the equatorial mount 2 Retract the screws so they no longer extend into the azimuth housing rectangular extrusion...

Страница 12: ...of the two oval tabs by pulling tightly 3 Line up the flat area on the inner portion of the R A slow motion knob with the flat area on the R A shaft see figure 2 5 4 Slide the R A slow motion knob ont...

Страница 13: ...ion knob fits over is toward the top of the mount just below the telescope mounting platform Once again you have two shafts to choose from Use the shaft that is pointing toward the ground This makes i...

Страница 14: ...t bar lock nut fully for added support The counterweight bar is now installed With the counterweight bar in place you are ready to attach the counterweights 1 Lock the DEC clamp to hold the mount in p...

Страница 15: ...at is attached to the telescope onto the CG 5 mount see figure 2 8 3 Tighten the knob on the CG 5 mount to hold the telescope in place NOTE Never loosen any of the knobs on the telescope tube or mount...

Страница 16: ...GRADUALLY to see which way the telescope rolls 3 Loosen the set screw on one or both counterweights 4 Move the counterweights to a point where they balance the telescope i e it remains stationary whe...

Страница 17: ...HE TELESCOPE TUBE COMPLETELY 5 Slightly loosen the balance bracket thumbscrew and slide the telescope eitherforwardorbackwarduntilitremainsstationarywhentheDECclamp is released Do NOT let go of the te...

Страница 18: ...pointing The latitude adjustment on the CG 5 mount has a range of 40 starting at 20 going up to 60 For rough adjustments in azimuth simply pick up the telescope and tripod and move it For fine adjust...

Страница 19: ...ver youmaywanttoremovethecounterweightsfrom thecounterweightbartolightenthemount If you are shipping the telescope via a common carrier you should completely disassemble the telescope and return all p...

Страница 20: ...er this does not mean that the C8 Optical Tube Assembly can not be used for astronomical viewing It can also be used with your own heavy duty German equatorial mount or it can be used as an altazimuth...

Страница 21: ...he C8 Optical Tube Assembly 11023 1 comes standard with a 6x30mm finder To ensure the finder and bracket are not damaged during shipping they are NOT attached to the telescope Begin by removing the fi...

Страница 22: ...etched a little 3 Position the O ring on the main body of the finder so that it is toward the front i e objective end of the finder 4 Slide the finder eyepiece end first into the front ring of the bra...

Страница 23: ...nt position and rotate the knurled slip ring clockwise until tight Once this is done you are ready to attach other accessories such as eye pieces diagonal prisms etc If you want to remove the visual b...

Страница 24: ...t screw on the star diagonal and slide the eyepiece out You can then replace it with another ocular Eyepieces are commonly referred to by focal length and barrel diameter The focal length of each eyep...

Страница 25: ...tar diagonal the image is inverted upside down and re versed from left to right This holds true for the 6x30 finder as well as the telescope For correct orientation through the telescope which is impo...

Страница 26: ...any turns about 40 to go from close focus approximately 25 feet to infinity For astronomical viewing out of focus star images are very diffuse making them difficult if not impossible to see If you tur...

Страница 27: ...you should align the finder during the day when it is easier to locate objects To align the finder 1 Choose a conspicuous object that is over 500 yards away This will eliminate any possible parallax...

Страница 28: ...ENARE PRESENT 1 Begin by finding a distant object that is fairly bright 2 Insert the eyepiece one with a large focal length into the telescope 3 Release the R A and DEC clamps and point the telescope...

Страница 29: ...the section on Polar Alignment 1 Orient the telescope so that the equatorial mount is pointing north as close to true north as possible You can use a landmark that you know faces north to get you in t...

Страница 30: ...ospheric conditions most observing is done in the range of 20 to 35 power for every inch of aperture which is 160 to 280 power for the G 8 Determining the field of view is important if you want to get...

Страница 31: ...al camera store If you wear corrective lenses specifically glasses you may want to remove them when observing with an eyepiece attached to your C8 When using a camera however you should always wear co...

Страница 32: ...or carry a minus sign in front of the number and those north are often preceded by a plus sign The celestial equivalent of longitude is called Right Ascension or R A for short Like the Earth s lines o...

Страница 33: ...ee the stars complete one circle because the sunlight during the day washes out the starlight However part of this circular motion of stars in this region of the sky can be seen by setting up a camera...

Страница 34: ...y i e they will not drift out of the field of view If your telescope does not use a motor drive all objects in the sky day or night will drift out of the field This apparent motion is caused by the Ea...

Страница 35: ...Big Dipper will change during the year and throughout the course of the night see figure 5 4 When the Big Dipper is difficult to locate try using Cassiopia Observers in the southern hemisphere are not...

Страница 36: ...his means the pole is now 89 above the northern horizon If you move one degree further south the same thing happens again As you can see from this example the distance from the northern horizon to the...

Страница 37: ...e telescope so that the optical tube is directly over the polar axis see figure 5 6 3 Move the mount in altitude and or azimuth until Polaris is in the field of view of the finder Rough azimuth adjust...

Страница 38: ...ng due south with the scope on the side of the mount insert the diagonal so it points straight up Insert a cross hair ocular and align the cross hairs to be parallel to declination and right ascension...

Страница 39: ...e Celestron Sky Maps 93722 or consulting a current astronomy magazine To align the R A setting circle 1 Locate a bright star near the celestial equator The farther you are from the celestial pole the...

Страница 40: ...This effect is more noticeable at higher power If you are using a motor drive and have polar aligned the Moon will remain centered Consult your local newspaper or a current astronomy magazine to find...

Страница 41: ...solar viewing use a Celestron solar filter 94162 This filter reduces the intensity of the Sun s light making it safe to view With this filter you can see sunspots as they move across the solar disk an...

Страница 42: ...this will no longer be necessary 2 Look up the coordinates in an atlas or reference book 3 Move the telescope in declination until the indicator is pointing at the correctdeclinationcoordinate 4 Move...

Страница 43: ...east corner The star is Alpha Andromedae 3 Move northeast approximately 7 There you will find two stars of equal brightness Delta and Pi Andromedae about 3 apart 4 Continue in the same direction anoth...

Страница 44: ...ost stars that make up the parallelogram Beta and Gamma Lyrae see figure 6 3 4 Point the finder half way between these two stars 5 Move about 1 2 toward Beta Lyrae but remaining on a line that connect...

Страница 45: ...on is out Seeing Seeing conditions refer to the stability of the atmosphere and directly effects the clarity of star images and the amount of fine detail seen in extended objects like the planets The...

Страница 46: ...inversions also tend to produce good seeing If you can t get a better location wait until the early morning hours when the surroundings are uniformly cool and the seeing is generallybetter Type 3 see...

Страница 47: ...are the mandatory features a camera needs for celestial photog raphy First a B setting which allows for time exposures This excludes point and shoot cameras and limits the selection to 35mm SLR camer...

Страница 48: ...body onto the T Ring the same as you would any other lens With your camera attached to the telescope you are ready for prime focus photography Start with an easy object like the Moon Here s how to do...

Страница 49: ...is will ensure that you will get a good photo If using black and white film try a yellow filter to reduce the light intensity and to increase contrast Keep accurate records of your exposures This info...

Страница 50: ...er and start the motor drive 2 Load your camera with slide film ISO 100 or faster or print film ISO 400 or faster 3 Set the f ratio of your camera lens so that it is a half stop to one full stop down...

Страница 51: ...t As you perfect your technique try specialized films that is films that are designed or specially treated for celestial photography Here are some popular choices Ektar 125 color print Fujichrome 100D...

Страница 52: ...hand held black card placed over the aperture of the telescope to act as a shutter The card prevents light from entering the telescope while the shutter is released Once the shutter has been released...

Страница 53: ...hot turn out Also don t expect to record more detail than you can see visually in the eyepiece at the time you are photographing Once you have mastered the technique experiment with different films di...

Страница 54: ...iding eyepiece Unlike piggyback photog raphy which allows for fairly loose guiding prime focus requires meticulous guiding for long periods To accomplish this you need a guiding ocular with an illumin...

Страница 55: ...stial photography Here are some popular choices Ektar 125 color print Fujichrome 100D color slide Tech Pan gas hypered black and white print There is no exposure determination table to help you get st...

Страница 56: ...ctor 94175 f 10 and f 20 with the optional 2x barlow 93507 making it the most versatile imaging system available today This makes the system ideal for imaging deep sky objects as well as planetary det...

Страница 57: ...lestron telescopes see figures below Figure 7 2 Light path at f 10 focus Figure 7 3 Light path at Fastar f 1 95 focus The key factors for good CCD imaging are exposure time field of view image size an...

Страница 58: ...e slower f number will usually require you to guide the image while you are taking longer exposures Guiding can be accomplished by using an optional Radial Guider or a piggyback guidescope The exposur...

Страница 59: ...s For every 10 exposures you might save 1 To image at f 20 you need to purchase a 2x Barlow and a T adapter or Radial Guider Imaging at f 20 1 Optical Tube Assembly 12 Pulstar Illuminator 2 Secondary...

Страница 60: ...on If you want to continue observing the dew must be removed either with a Celestron Dew Eliminator 94122 or by pointing the telescope at the ground until the dew has evaporated The optional Dew Cap L...

Страница 61: ...lished with the telescope in focus In this instance you are observing the Airy disk see figure 8 2 not the shadow of the secondary housing This stellar image appears as a bright point of light with a...

Страница 62: ...It features a 10 000 object database 75 color images horizontal projection custom sky chart printing zoom capability Comet Hale Bopp coordinates and more A fun useful and educational product PC forma...

Страница 63: ...30mm 35mm and 42mm These eyepieces are all parfocal The 35mm Ultima gives the widest possible field of view with a 1 1 4 diagonal and is ideal for use with or without the Reducer Corrector Lanthanum...

Страница 64: ...p sky astronomical objects when viewed from urban areas LPR Filters selectively reduce the transmission of certain wavelengths of light specifically those produced by artificial lights This includes m...

Страница 65: ...north The finderscope has an eyepiece with etched reticle for quick polar alignment Radial Guider 94176 The Celestron Radial Guider is specifically de signed for use in prime focus deep sky astrophoto...

Страница 66: ...ntrast This filter can be used for both visual observation and photography of the Sun NOTE NEVER LOOK DIRECTLY AT THE SUN WITH THE NAKED EYE OR WITH A TELESCOPE NEVERPOINTYOURTELESCOPEATTHESUNUNLESS Y...

Страница 67: ...11 NGC6705 Sct 18 51 1 6 16 5 8 Op Cl Wild Duck Cluster M12 NGC6218 Oph 16 47 2 1 57 6 6 Gl Cl M13 NGC6205 Her 16 41 7 36 28 5 9 Gl Cl HerculesCluster M14 NGC6402 Oph 17 37 6 3 15 7 6 Gl Cl M15 NGC707...

Страница 68: ...0 3058 7 0 Gl Cl M56 NGC6779 Lyr 19 16 6 30 11 8 2 Gl Cl M57 NGC6720 Lyr 18 53 6 33 02 9 0 P Neb RingNebula M58 NGC4579 Vir 12 37 7 11 49 9 8 Sp Gx M59 NGC4621 Vir 12 42 0 11 39 9 8 El Gx M60 NGC4649...

Страница 69: ...68 Leo 10 46 8 11 49 9 2 Sp Gx M97 NGC3587 UMa 11 14 9 55 01 11 2 P Neb OwlNebula M98 NGC4192 Com 12 13 8 14 54 10 1 Sp Gx M99 NGC4254 Com 12 18 8 14 25 9 8 Sp Gx Pin Wheel Nebula M100 NGC4321 Com 12...

Страница 70: ...2 0 01 Vega Lyr 18 36 56 38 47 01 0 04 Capella Aur 05 16 41 45 59 53 0 05 Rigel Ori 05 14 32 08 12 06 0 14 Procyon CMi 07 38 18 05 13 30 0 37 Betelgeuse Ori 05 55 10 07 24 26 0 41 Achernar Eri 01 37 4...

Страница 71: ...inson Costanzo Chaple NGC2000 0 Sinnott General Observational Astronomy TheCambridgeAstronomyGuide Liller Mayer A Complete Manual Of Amateur Astronomy Sherrod The Guide To Amateur Astronomy Newton Tee...

Страница 72: ...repair Further product malfunction or deterioration due to normal wear is not covered by this warranty CI DISCLAIMS ANY WARRANTIES EXPRESS OR IMPLIED WHETHER OF MERCHANTABILITY OF FITNESS FOR A PARTI...

Страница 73: ...Street Torrance CA 90503 Tel 310 328 9560 Fax 310 212 5835 Website http www celestron com Copyright1999CelestronInternational Allrightreserved Productsorinstructionsmaychange withoutnoticeorobligatio...

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