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Celestron OMNI XLT 102 manual Table of Contents

Models: OMNI XLT 102

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Table of Contents

INTRODUCTION	4
Warning	4
ASSEMBLY	8
Setting up the Tripod	8
Attaching the Equatorial Mount	9
Attaching the Center Leg Brace	10
Installing the Counterweight Bar	10
Installing the Counterweights	11
Attaching the Slow Motion Control Knobs (Cables)	11
Attaching the Telescope Tube to the Mount	12
Installing the Finderscope	13
Installing the Visual Back	13
Installing the Star Diagonal	14
Installing the Eyepieces	14
Moving the Telescope Manually	15
Balancing the Mount in R.A	15
Balancing the Mount in DEC	16
Adjusting the Mount	16
Adjusting the Mount in Altitude	17
Adjusting the Mount in Azimuth	17
TELESCOPE BASICS	18
Image Orientation	20
Focusing	20
Aligning the Finderscope	21
Calculating Magnification	21
Determining Field of View	22
General Observing Hints	22
ASTRONOMY BASICS	23
The Celestial Coordinate System	23
Motion of the Stars	24
Latitude Scale	25
Pointing at Polaris	25
Finding the North Celestial Pole	26
Polar Alignment in the Southern Hemisphere	27
Pointing at Sigma Octantis	28
Finding the South Celestial Pole (SCP)	28
Declination Drift Method of Polar Alignment	29
Aligning the R.A. Setting Circle	30
Using the R.A. Vernier Scale	31
CELESTIAL OBSERVING	32
Observing the Moon	32
Lunar Observing Hints	32
Observing the Planets	32
Observing the Sun	33
Solar Observing Hints	33
Observing Deep Sky Objects	33
Seeing Conditions	33
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Celestron OMNI XLT 102 manual Table of Contents

Contents

Omni XLT Omni XLT Series TelescopesINSTRUCTION MANUAL Omni XLT 102EDTable of Contents Transparency proper solar filter. Permanent and irreversible eye damage may result Counterweight Bar Accessory Tray/ Leg BraceCounterweights Latitude Adjustment ScrewFocuser Figure 1-2 Omni XLT 150 NewtonianFinderscope Bracket Accessory Tray/ Leg BraceLatitude Scale Declination Setting CircleFigure 1-3 Omni XLT 127 Schmidt-Cassegrain Schmidt Corrector LensSetting up the Tripod Attaching the Equatorial Mount Installing the Counterweight Bar Attaching the Center Leg BraceInstalling the Counterweights Attaching the Slow Motion Control Knobs CablesScrew Attaching the Telescope Tube to the MountTube Rings Mounting Bracket Mounting Platform Telescope Mounting make contact with the finderscope body Installing the FinderscopeInstalling the Visual Back Installing the Star Diagonal Installing the EyepiecesDEC Clamp R.A. Clamp Moving the Telescope ManuallyBalancing the Mount in R.A GO OF THE TELESCOPE TUBE COMPLETELY Adjusting the MountBalancing the Mount in DEC Adjusting the Mount in Altitude Adjusting the Mount in AzimuthA cutaway view of the light path of the Refractor optical design A cutaway view of the light path of the Newtonian optical design Actual image orientation as seen with the unaided eye FocusingImage Orientation Reversed from left to right, asAligning the Finderscope Calculating MagnificationDetermining Field of View General Observing HintsThe Celestial Coordinate System The celestial sphere seen from the outside showing R.A. and DECStarts seen near the celestial equator Motion of the StarsStarts seen near the north celestial pole Latitude Scale Pointing at PolarisFinding the North Celestial Pole Big Dipper Polar Alignment in the Southern HemispherePolar Alignment with the Latitude Scale Litle DipperPointing at Sigma Octantis Finding the South Celestial Pole SCPDeclination Drift Method of Polar Alignment Aligning the R.A. Setting Circle Using the R.A. Vernier Scale Observing the Planets Observing the MoonLunar Observing Hints Planetary Observing HintsObserving Deep Sky Objects Observing the SunSolar Observing Hints Seeing ConditionsUsing the Lens Cap Aperture Stop with Refractor Telescopes SeeingPiggyback Photography Short Exposure Prime Focus Photography for Schmidt-Cassegrains Using Digital CamerasShort Exposure Prime Focus Photography for Refractors & Newtonians See note about digital cameras belowEyepiece Projection for a Schmidt-Cassegrain Long Exposure Prime Focus Photography Planetary and Lunar Photography with Special Imagers Metering CCD Imaging for Deep Sky ObjectsTerrestrial Photography Reducing Vibrationrub in circles Care and Cleaning of the OpticsCollimation of Refractors Collimation of a Schmidt-Cassegrain two 2 turnsTo make collimation a simple procedure, follow these easy steps Aligning the Primary Mirror Collimation of a NewtonianAligning the Secondary Mirror Both mirrors aligned with the collimating cap in the focuser Primary mirror needs Secondary mirror needsadjustment adjustmentSecondary Mirror PrimaryProcedure -- Please read this section completely before beginning Night Time Star Collimatingdiffraction appearpattern Series 3 - # Series 1 - #Series 2 - # Series 4 - #Page Page Appendix A Technical Specifications Appendix B - Glossary of Terms Page Page Page Page Page Page Page Page Celestron Two Year Warranty Products or instructions may change without notice or obligation Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. 310Copyright 2008 Celestron All rights reserved Item # 21088-INST Rev Printed in China $10.00