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Celestron C8-NGT, C10-N manual Aligning the Primary Mirror

Models: C10-N C8-NGT C8-N

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Aligning the Primary Mirror

If you have an eyepiece in the focuser, remove it. Rack the focuser tube in completely, using the focusing knobs, until its silver tube is no longer visible. You will be looking through the focuser at a reflection of the secondary mirror, projected from the primary mirror. During this step, ignore the silhouetted reflection from the primary mirror. Insert the collimating cap into the focuser and look through it. With the focus pulled in all the way, you should be able to see the entire primary mirror reflected in the secondary mirror. If the primary mirror is not centered in the secondary mirror, adjust the secondary mirror screws by alternately tightening and loosening them until the periphery of the primary mirror is centered in your view. DO NOT loosen or tighten the center screw in the secondary mirror support, because it maintains proper mirror position.

Aligning the Primary Mirror

Now adjust the primary mirror screws to re-center the reflection of the small secondary mirror, so it’s silhouetted against the view of the primary. As you look into the focuser, silhouettes of the mirrors should look concentric. Repeat steps one and two until you have achieved this.

Remove the collimating cap and look into the focuser, where you should see the reflection of your eye in the secondary mirror.

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Celestron C8-NGT, C10-N manual Aligning the Primary Mirror

Contents

C10-N / C10-N C8-N / C8-NGTINSTRUCTION MANUAL Advanced Series Advanced Series GTAdjusting the Mount in Altitude TELESCOPE BASICS Some of the many standard features of the Advanced GT include C8-N Shown Fig 1-1 - The Advanced Series NewtonianC8-NGT Shown Fig 1-2 - The Advanced Series GT NewtonianAttaching the Equatorial Mount Setting up the Tripod31061 11047Attaching the Center Leg Brace Installing the Counterweight BarInstalling the Counterweight Attaching the Hand Control Holder Advanced GT Models OnlyAttaching the Slow Motion Knobs For Non-GT Models Only Attaching the Telescope Tube to the Mount Installing the Finderscope Installing the Eyepiecestelescope Balancing the Tube in R.A Balancing the Telescope in DECOF THE TELESCOPE TUBE COMPLETELY Adjusting the Mount in Altitude Adjusting the MountAdjusting the Mount in Azimuth Powering the TelescopeAttaching the Declination Cable For GT Models Only The Advanced GT Hand Control Named Stars Hand Control OperationNamed Objects Double StarsStartup Procedure Alignment ProceduresAuto Three-Star Align Auto AlignQuick-Align Last AlignmentRe-Alignment Selecting an Object Object CatalogSlewing to an Object Finding PlanetsConstellation Tour Tour ModeDirection Buttons Rate Button1 = 2 = 1x sidereal 3 = 4 = 5 = Setup Procedures6 = 7 = .5º / sec 8 = 2º / sec 9 = 3º / sec Nine available slew speedsIdentify Precise GoTo Scope Setup FeaturesObserving Tip Helpful Hint Utility Features Helpful Hint MENU ADVANCED GTALIGNMENT LISTA cutaway view of the light path of the Newtonian optical design Image OrientationAligning the Finderscope FocusingCalculating Magnification Actual image orientation as seen with the unaided eyeGeneral Observing Hints Determining Field of ViewThe celestial sphere seen from the outside showing R.A. and DEC The Celestial Coordinate SystemMotion of the Stars Pointing at Polaris Latitude Scalesthe south celestial pole Finding the North Celestial PoleDeclination Drift Method of Polar Alignment Lunar Observing Hints Observing the MoonObserving the Planets Observing the SunObserving Deep Sky Objects Solar Observing HintsSeeing Conditions TransparencySeeing conditions directly affect image quality. These drawings represent a point source i.e., star under bad seeing conditions left to excellent conditions right. Most often, seeing conditions produce images that lie some where between these two extremes Piggyback Short Exposure Prime Focus Photography Metering Terrestrial PhotographyReducing Vibration Lunar PhaseAuto Guiding Care and Cleaning of the Optics CollimationAligning the Secondary Mirror Aligning the Primary Mirror Procedure Please read this section completely before beginning Night Time Star CollimatingPage Series 1 - #94119-10 40mmOrange, Light Blue, ND13%T, Polarizing #s 21, 80A, #15, Polarizing Series 2 - #94119-20Light Red, Blue, Green, ND50% T #s 23A, 38A, 58, 96ND-50 Series 3 - #94119-30Series 4 - #94119-40 Yellow, Deep Yellow, Violet, Pale Blue #s 8, 47, 82A, 96ND-13Page Advanced Series Appendix A - Technical Specifications31061 11047Appendix B - Glossary of Terms Page Page CONNECTICUT APPENDIX C LONGITUDES AND LATITUDESLONGITUDE LONGITUDE LONGITUDE INTERNATIONAL CANADAPC Command ASCII Appendix D - RS-232 ConnectionCommunication Protocol DescriptionAdditional RS232 Commands Reset The Position Of Azm Or AltSend Any Track Rate Through RS232 To The Hand Control APPENDIX E - MAPS OF TIME ZONES Page Page Page Page Page Page Page CELESTRON TWO YEAR WARRANTY Fax. 310 Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. 310Copyright 2003 Celestron All rights reserved Products or instructions may change without notice or obligation