Celestron CR-150 HD T A B L E O F C O N T E N T S, Assembling the CG-5Equatorial Mount

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	T A B L E O F C O N T E N T S
▲	INTRODUCTION	4
	How to Use this Manual	5
	A Word of Caution	5
	TheRefractor OpticalSystem	6
▲	ASSEMBLING YOUR CR-150 HD	7
	The CR-150 HD	8
	Assembling the CG-5 Equatorial Mount	9
	Setting Up the Tripod	9
	Adjusting the Tripod Height	9
	Attaching the Accessory Tray	10
	Attaching the Equatorial Mount	11
	Attaching the R.A. Slow Motion Knob	12
	Attaching the Declination Slow Motion Knob	13
	Attaching the Counterweight Bar and Counterweights	14
	Attaching the Telescope to the Mount	15
	Removing the Lens Cap	16
	Balancing the Telescope in R.A	17
	Balancing the Telescope in DEC	17
	Adjusting the Mount in Altitude	18
	Adjusting the Mount in Azimuth	18
	Disassembling and Transporting Your CR-150 HD	19
	Storing Your CR-150 HD	19
	Technical Specification	19
▲ TELESCOPE BASICS		2 0
	Attaching the Accessories	20
	The Star Diagonal	20
	The Eyepiece	20
	Focusing	22
	Attaching the Finder	22
	Aligning the Finder	23
	Image Orientation	24
	Your First Look	24
	Daytime Observing	24
	Nighttime Observing	25
	Calculating Magnification	26
	Determining Field of View	26
	General Photography Hints	27
▲	ASTRONOMY BASICS	2 8
	The Celestial Coordinate System	28
	Motion of the Stars	29
	Polar Alignment	30
	Finding the Pole	31
	Latitude Scales	32
	Pointing at Polaris	33
	Declination Drift	34
	Polar Alignment Finders	35
	Aligning the R.A. Setting Circle	35

ii • Table of Contents

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Contents 6 Refractor Model #21017The CR-150HD Assembling the CG-5Equatorial Mount T A B L E O F C O N T E N T Sii Table of Contents Using the Lens Cap Aperture Stop Table of ContentsI N T R O D U C T I O N 4 IntroductionHow to Use This Manual AWordofCaution Introduction6 Introduction The Refractor Optical SystemThe Mount A S S E M B L I N G Y O U R C R - 1 5 0 H D Unpacking Your CR-150HDThe CR-150HD Tripod Head Setting Up the Tripod Adjusting the Tripod HeightAssembling the CG-5Equatorial Mount Attaching the Accessory Tray 10 The CR-150HDAttaching the Equatorial Mount Attaching the R.A. Slow Motion Knob 12 The CR-150HDAttaching the Declination Slow Motion Knob 1.Lock the DEC clamp to hold the mount in place 14 The CR-150HDAttaching the Telescope to the Mount Tube Rings Dovetail BracketBalancing the Telescope in R.A 16 The CR-150HDBalancing the Telescope in DEC COMPLETELY18 The CR-150HD Adjusting the Mount in AltitudeAdjusting the Mount in Azimuth Storing Your CR- 150 HD Technical SpecificationsDisassembling and Transporting Your CR 150 HD OPTICAL TUBEThe Star Diagonal Attaching the AccessoriesT E L E S C O P E B A S I C S The EyepieceAdapter 1 1/4 AccessoryFocuser Tension Built-inT-Adapter22 Telescope Basics FocusingAttaching the Finder Aligning the Finder DaytimeObserving Image OrientationYourFirstLook NEVER POINT YOUR TELESCOPE AT THE SUN UNLESSNighttime Observing 26 Telescope Basics Calculating MagnificationDetermining Field of View GeneralPhotographyHints Your Celestron telescope can be used for both terrestrial and astronomical photography. Your telescope has a fixed aperture and, as a result, a fixed f/ratio. To properly expose your subjects photographically, you need to set your shutter speed accordingly. Most 35mm single lens reflex SLR cameras offer through-the-lens metering that lets you know if your picture is under or overexposed. This is important for terrestrial photography where exposure times are measured in fractions of a second. In astrophotography, the exposures are much longer, requiring that you use the “B” setting on your camera. The actual exposure time is determined by how long you keep the shutter open. More on this in the section on “Celestial Photography.” 28 Astronomy Basics A S T R O N O M Y B A S I C SThe Celestial Coordi- nate System Motion of the Stars Astronomy BasicsDefinition Polar AlignmentEquator 30 Astronomy BasicsFinding the Pole Latitude Scales 32 Astronomy BasicsPointingatPolaris DeclinationDrift 34 Astronomy BasicsAligning the R.A Setting Circle Polar Alignment FindersPlanets Observing the MoonObserving the C E L E S T I A L O B S E R V I N GSOLAROBSERVINGHINTS Using the Lens Cap Aperture StopObserving the Sun Celestial Observing38 Celestial Observing Using the Setting CirclesObserving Deep-SkyObjects StarHopping 40 Celestial Observing Sky Illumination Viewing ConditionsTransparency Seeing42 Celestial Observing C E L E S T I A L P H O T O G R A P H Y Celestial PhotographyCrescent Short Exposure Prime FocusLunar Phase QuarterThe exposure times listed here should be used as a starting point. Always make exposures that are longer and shorter than the recommended time. Also, try bracketing your exposures, taking a few photos at each shutter speed. This 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 Piggyback 46 Celestial PhotographyEktar 1000 color print Konica 3200 color print Projection Photography 48 Celestial PhotographyTelescope Maintenance Care and Cleaning of the OpticsT E L E S C O P E M A I N T E N A N C E Dual Axis Drive System - #93523 50 Optional AccessoriesO P T I O N A L A C C E S S O R I E S Super Modified Achromatic SMA EyepiecesOptional Accessories 52 Optional Accessories Motor Drive System - #93518Const THEMESSIERCATALOGNGC# Type54 The Messier Catalog Type Star Name LIST OF BRIGHT STARSEpoch ConstellationAtlases FOR FURTHER READINGAstronomy Texts General Observational AstronomyCELESTRON ONE YEAR WARRANTY Item #21017-INST Price $10.00 Celestron International 2835 Columbia StreetTorrance, CA Tel Fax