T E L E S C O P E M A I N T E N A N C E | Celestron CR-150 HD

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Celestron CR-150 HD T E L E S C O P E M A I N T E N A N C E, Care and Cleaning of the Optics, Telescope Maintenance

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 Table of Contents Using the Lens Cap Aperture Stop 4 Introduction I N T R O D U C T I O N Introduction How to Use This Manual AWordofCaution The Mount The Refractor Optical System6 Introduction Unpacking Your CR-150HD A S S E M B L I N G Y O U R C R - 1 5 0 H D The CR-150HD Assembling the CG-5Equatorial Mount Setting Up the Tripod Adjusting the Tripod HeightTripod Head 10 The CR-150HD Attaching the Accessory Tray Attaching the Equatorial Mount 12 The CR-150HD Attaching the R.A. Slow Motion Knob Attaching the Declination Slow Motion Knob 14 The CR-150HD 1.Lock the DEC clamp to hold the mount in place Tube Rings Dovetail Bracket Attaching the Telescope to the Mount 16 The CR-150HD Balancing the Telescope in R.A COMPLETELY Balancing the Telescope in DEC Adjusting the Mount in Azimuth Adjusting the Mount in Altitude18 The CR-150HD Disassembling and Transporting Your CR 150 HD Technical SpecificationsStoring Your CR- 150 HD OPTICAL TUBE T E L E S C O P E B A S I C S Attaching the AccessoriesThe Star Diagonal The Eyepiece Focuser Tension 1 1/4 AccessoryAdapter Built-inT-Adapter Attaching the Finder Focusing22 Telescope Basics Aligning the Finder YourFirstLook Image OrientationDaytimeObserving NEVER POINT YOUR TELESCOPE AT THE SUN UNLESS Nighttime 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 Astronomy Basics Motion of the Stars Equator Polar AlignmentDefinition 30 Astronomy Basics Finding the Pole 32 Astronomy Basics Latitude Scales PointingatPolaris 34 Astronomy Basics DeclinationDrift Polar Alignment Finders Aligning the R.A Setting Circle Observing the Observing the MoonPlanets C E L E S T I A L O B S E R V I N G Observing the Sun Using the Lens Cap Aperture StopSOLAROBSERVINGHINTS Celestial Observing Observing Deep-SkyObjects Using the Setting Circles38 Celestial Observing StarHopping 40 Celestial Observing Transparency Viewing ConditionsSky Illumination Seeing 42 Celestial Observing Celestial Photography C E L E S T I A L P H O T O G R A P H Y Lunar Phase Short Exposure Prime FocusCrescent Quarter The 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 46 Celestial Photography Piggyback Ektar 1000 color print Konica 3200 color print 48 Celestial Photography Projection Photography T 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 O P T I O N A L A C C E S S O R I E S 50 Optional AccessoriesDual Axis Drive System - #93523 Super Modified Achromatic SMA Eyepieces Optional Accessories Motor Drive System - #93518 52 Optional Accessories NGC# THEMESSIERCATALOGConst Type 54 The Messier Catalog Const Epoch LIST OF BRIGHT STARSStar Name Constellation Astronomy Texts FOR FURTHER READINGAtlases General Observational Astronomy CELESTRON ONE YEAR WARRANTY Torrance, CA Tel Fax Celestron International 2835 Columbia StreetItem #21017-INST Price $10.00