Celestron CR-150 HD instruction manual DeclinationDrift, Astronomy Basics

Contents The CR-150HD Model #210176 Refractor ii Table of Contents T A B L E O F C O N T E N T SAssembling the CG-5Equatorial Mount 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 IntroductionThe Mount The Refractor Optical System6 Introduction 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 Assembling the CG-5Equatorial Mount Setting Up the Tripod Adjusting the Tripod HeightTripod Head 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 COMPLETELYAdjusting the Mount in Azimuth Adjusting the Mount in Altitude18 The CR-150HD 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-AdapterAttaching the Finder Focusing22 Telescope Basics Aligning the Finder DaytimeObserving Image OrientationYourFirstLook NEVER POINT YOUR TELESCOPE AT THE SUN UNLESSNighttime Observing Determining Field of View Calculating Magnification26 Telescope Basics 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.” The Celestial Coordi- nate System A S T R O N O M Y B A S I C S28 Astronomy Basics 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 ObservingObserving Deep-SkyObjects Using the Setting Circles38 Celestial Observing 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 PhotographyT E L E S C O P E M A I N T E N A N C E Care and Cleaning of the OpticsTelescope Maintenance 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 Torrance, CA Tel Fax Celestron International 2835 Columbia StreetItem #21017-INST Price $10.00