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Celestron OMNI XLT 102 Primary mirror needs Secondary mirror needsadjustment adjustment, Mirror

Models: OMNI XLT 102

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Primary mirror needs

Newtonian collimation views as seen through the focuser using the collimation cap

Primary mirror needs

Secondary mirror needsadjustment adjustment

Secondary

Mirror

Both mirrors aligned with the collimating cap in the focuser.

Primary	Mirror Clip
Mirror

Both mirrors aligned with your eye looking into the focuser.

45

Image 45

Celestron OMNI XLT 102 Primary mirror needs Secondary mirror needsadjustment adjustment, Secondary Mirror, Mirror Clip

Contents

INSTRUCTION MANUAL Omni XLT Series TelescopesOmni XLT Omni XLT 102EDTable of Contents Transparency proper solar filter. Permanent and irreversible eye damage may result Counterweights Accessory Tray/ Leg BraceCounterweight Bar Latitude Adjustment ScrewFinderscope Bracket Figure 1-2 Omni XLT 150 NewtonianFocuser Accessory Tray/ Leg BraceFigure 1-3 Omni XLT 127 Schmidt-Cassegrain Declination Setting CircleLatitude Scale Schmidt Corrector LensSetting up the Tripod Attaching the Equatorial Mount Attaching the Center Leg Brace Installing the Counterweight BarAttaching the Slow Motion Control Knobs Cables Installing the CounterweightsAttaching the Telescope Tube to the Mount Tube Rings Mounting Bracket Mounting Platform Telescope MountingScrew Installing the Finderscope Installing the Visual Backmake contact with the finderscope body Installing the Eyepieces Installing the Star DiagonalMoving the Telescope Manually Balancing the Mount in R.ADEC Clamp R.A. Clamp Adjusting the Mount Balancing the Mount in DECGO OF THE TELESCOPE TUBE COMPLETELY Adjusting the Mount in Azimuth Adjusting the Mount in AltitudeA cutaway view of the light path of the Refractor optical design A cutaway view of the light path of the Newtonian optical design Image Orientation FocusingActual image orientation as seen with the unaided eye Reversed from left to right, asCalculating Magnification Aligning the FinderscopeGeneral Observing Hints Determining Field of ViewThe celestial sphere seen from the outside showing R.A. and DEC The Celestial Coordinate SystemMotion of the Stars Starts seen near the north celestial poleStarts seen near the celestial equator Pointing at Polaris Latitude ScaleFinding the North Celestial Pole Polar Alignment with the Latitude Scale Polar Alignment in the Southern HemisphereBig Dipper Litle DipperFinding the South Celestial Pole SCP Pointing at Sigma OctantisDeclination Drift Method of Polar Alignment Aligning the R.A. Setting Circle Using the R.A. Vernier Scale Lunar Observing Hints Observing the MoonObserving the Planets Planetary Observing HintsSolar Observing Hints Observing the SunObserving Deep Sky Objects Seeing ConditionsSeeing Using the Lens Cap Aperture Stop with Refractor TelescopesPiggyback Photography Short Exposure Prime Focus Photography for Refractors & Newtonians Using Digital CamerasShort Exposure Prime Focus Photography for Schmidt-Cassegrains See note about digital cameras belowEyepiece Projection for a Schmidt-Cassegrain Long Exposure Prime Focus Photography Planetary and Lunar Photography with Special Imagers Terrestrial Photography CCD Imaging for Deep Sky ObjectsMetering Reducing VibrationCare and Cleaning of the Optics Collimation of Refractorsrub in circles two 2 turns Collimation of a Schmidt-CassegrainTo make collimation a simple procedure, follow these easy steps Collimation of a Newtonian Aligning the Secondary MirrorAligning the Primary Mirror Secondary Mirror Primary mirror needs Secondary mirror needsadjustment adjustmentBoth mirrors aligned with the collimating cap in the focuser PrimaryNight Time Star Collimating Procedure -- Please read this section completely before beginningappear patterndiffraction Series 2 - # Series 1 - #Series 3 - # 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 Copyright 2008 Celestron All rights reserved Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. 310Products or instructions may change without notice or obligation Item # 21088-INST Rev Printed in China $10.00