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Celestron OMNI XLT 102 manual Appendix A Technical Specifications

Models: OMNI XLT 102

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Appendix A Technical Specifications


Omni XLT Series	21088	21092	21090	21094	31057	11084
	Omni XLT 102	Omni XLT 102ED	Omni XLT 120	Omni XLT 150R	Omni XLT 150	Omni XLT 127

Optical Design	Refractor	Refractor	Refractor	Refractor	Newtonian	Schmidt-Cassegrain
Aperture	102mm (4.0")	102mm (4.0")	120mm (4.7")	150mm (6.0")	150mm (6.0")	127mm (5.0")
Focal Length	1000mm	900mm	1000mm	750mm	750mm	1250mm
Focal Ratio	f/10	f/9	f/8.3	f/5	f/5	f/10
Optical Coatings	Starbright XLT	Starbright XLT	Starbright XLT	Starbright XLT	Starbright XLT	Starbright XLT
Finderscope	6x30	6x30	6x30	6x30	6x30	6x30
Star Diagonal	1.25"	1.25"	1.25"	1.25"	n/a	1.25"
Eyepiece - std. 1.25" MC 50° FOV	25mm (40x)	25mm (36x)	25mm (40x)	25mm (30x)	25mm (30x)	25mm (50x)
Mount - Equatorial	Omni CG-4	Omni CG-4	Omni CG-4	Omni CG-4	Omni CG-4	Omni CG-4
Tripod Legs	1.75" Stainless	1.75 Stainless	1.75" Stainless	1.75" Stainless	1.75" Stainless	1.75" Stainless
	3.2kg (7#) &	3.2kg (7#) &	3.2kg (7#) &	3.2kg (7#) &	3.2kg (7#) &	3.2kg (7#) &
Counterweights	1.8kg (4#)	1.8kg (4#)	1.8kg (4#)	1.8kg (4#)	1.8kg (4#)	1.8kg (4#)
Highest Useful Magnification	240x	240x	283x	360x	360x	300x
Lowest Useful Magnification	15x	15x	17x	21x	21x	18x
Limiting Stellar Magnitude	12.5	12.5	12.9	13.4	13.4	13.1
Resolution: Raleigh -arc seconds	1.36	1.36	1.19	0.92	0.92	1.1
Resolution: Dawes Limit " "	1.14	1.14	0.97	0.76	0.76	0.91
Light Gathering Power	212x	212x	294x	459x	459x	329x
Field of View - Angular w/25mm ep	1.25°	1.4°	1.25°	1.67°	1.67°	1.0°
Field of View - Linear w/25mm ep	66 ft. @1000yds	74 ft. @1000yds	66 ft. @1000yds	88 ft. @ 1000yds	88 ft. @1000yds	53 ft. @1000yds
Optical Tube Length	39.5" (1003mm)	37.0" (940mm)	40.0" (1016mm)	34.0" (864mm)	26.5" (673mm)	11.0" (279mm)
Optical Tube Weight	9.5 # ( 4.3kg)	8.0# (3.6kg)	12.5 # ( 5.7kg)	16.0 # (7.3kg)	12.0 # (5.4kg)	6.5 # ( 3.0kg)
Mount & Counterweights - Weight	21.0 # ( 9.5kg)	21.0 # ( 9.5kg)	21.0 # ( 9.5kg)	21.0# (9.5kg)	21.0 # ( 9.5kg)	21.0 # ( 9.5kg)
Tripod Weight	12.5 # ( 5.7kg)	12.5 # ( 5.7kg)	12.5 # (5.7kg)	12.5 # (5.7kg)	12.5 # ( 5.7kg)	12.5 # ( 5.7kg)
Total Weight	43.0 # ( 19.5kg)	41.5 # ( 18.8kg)	46.0 # ( 20.9kg)	49.5 # ( 22.5kg)	45.5 # (20.6kg)	40.0 # (18.1kg)
Note:	Specifications subject to change without notice or obligation

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Celestron OMNI XLT 102 manual Appendix A Technical Specifications

Contents

Omni XLT 102ED Omni XLT Series TelescopesINSTRUCTION MANUAL Omni XLTTable of Contents Transparency proper solar filter. Permanent and irreversible eye damage may result Latitude Adjustment Screw Accessory Tray/ Leg BraceCounterweights Counterweight BarAccessory Tray/ Leg Brace Figure 1-2 Omni XLT 150 NewtonianFinderscope Bracket FocuserSchmidt Corrector Lens Declination Setting CircleFigure 1-3 Omni XLT 127 Schmidt-Cassegrain Latitude ScaleSetting 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 Reversed from left to right, as FocusingImage Orientation Actual image orientation as seen with the unaided eyeCalculating 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 Litle Dipper Polar Alignment in the Southern HemispherePolar Alignment with the Latitude Scale Big 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 Planetary Observing Hints Observing the MoonLunar Observing Hints Observing the PlanetsSeeing Conditions Observing the SunSolar Observing Hints Observing Deep Sky ObjectsSeeing Using the Lens Cap Aperture Stop with Refractor TelescopesPiggyback Photography See note about digital cameras below Using Digital CamerasShort Exposure Prime Focus Photography for Refractors & Newtonians Short Exposure Prime Focus Photography for Schmidt-CassegrainsEyepiece Projection for a Schmidt-Cassegrain Long Exposure Prime Focus Photography Planetary and Lunar Photography with Special Imagers Reducing Vibration CCD Imaging for Deep Sky ObjectsTerrestrial Photography MeteringCare 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 Primary Primary mirror needs Secondary mirror needsadjustment adjustmentSecondary Mirror Both mirrors aligned with the collimating cap in the focuserNight Time Star Collimating Procedure -- Please read this section completely before beginningappear patterndiffraction Series 4 - # Series 1 - #Series 2 - # Series 3 - #Page Page Appendix A Technical Specifications Appendix B - Glossary of Terms Page Page Page Page Page Page Page Page Celestron Two Year Warranty Item # 21088-INST Rev Printed in China $10.00 Celestron 2835 Columbia Street Torrance, CA 90503 U.S.A. Tel. 310Copyright 2008 Celestron All rights reserved Products or instructions may change without notice or obligation