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Celestron CR-150 HD Celestron International 2835 Columbia Street, Torrance, CA Tel Fax

Models: CR-150 HD

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Celestron International

2835 Columbia Street

Torrance, CA 90503

Tel: 310-328-9560

Fax: 310-212-5835

Web site: www.celestron.com

(Products or instructions may change without notice or obligation).

Item #21017-INST 10-99

Price $10.00

Page 59

Image 59

Celestron CR-150 HD Celestron International 2835 Columbia Street, Torrance, CA Tel Fax, Item #21017-INST Price $10.00

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 Table of Contents Using the Lens Cap Aperture Stop4 Introduction I N T R O D U C T I O NIntroduction How to Use This Manual AWordofCaution6 Introduction The Refractor Optical SystemThe Mount Unpacking Your CR-150HD A S S E M B L I N G Y O U R C R - 1 5 0 H DThe CR-150HD The CR-150HD Setting Up the Tripod Adjusting the Tripod HeightAssembling the CG-5Equatorial Mount Tripod Head10 The CR-150HD Attaching the Accessory TrayThe CR-150HD Attaching the Equatorial Mount12 The CR-150HD Attaching the R.A. Slow Motion KnobThe CR-150HD Attaching the Declination Slow Motion Knob14 The CR-150HD 1.Lock the DEC clamp to hold the mount in placeTube Rings Dovetail Bracket Attaching the Telescope to the MountThe CR-150HD 16 The CR-150HD Balancing the Telescope in R.AThe CR-150HD Balancing the Telescope in DECCOMPLETELY 18 The CR-150HD Adjusting the Mount in AltitudeAdjusting the Mount in Azimuth OPTICAL TUBE Technical SpecificationsDisassembling and Transporting Your CR 150 HD Storing Your CR- 150 HDThe Eyepiece Attaching the AccessoriesT E L E S C O P E B A S I C S The Star DiagonalBuilt-inT-Adapter 1 1/4 AccessoryFocuser Tension Adapter22 Telescope Basics FocusingAttaching the Finder Telescope Basics Aligning the FinderNEVER POINT YOUR TELESCOPE AT THE SUN UNLESS Image OrientationYourFirstLook DaytimeObservingTelescope Basics • Nighttime Observing26 Telescope Basics Calculating MagnificationDetermining Field of View 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.”28 Astronomy Basics A S T R O N O M Y B A S I C SThe Celestial Coordi- nate System Astronomy Basics Motion of the Stars30 Astronomy Basics Polar AlignmentEquator DefinitionAstronomy Basics Finding the PoleDefinition 32 Astronomy Basics Latitude ScalesAstronomy Basics PointingatPolaris34 Astronomy Basics DeclinationDriftAstronomy Basics Aligning the R.A Setting CirclePolar Alignment Finders C E L E S T I A L O B S E R V I N G Observing the MoonObserving the PlanetsCelestial Observing Using the Lens Cap Aperture StopObserving the Sun SOLAROBSERVINGHINTS38 Celestial Observing Using the Setting CirclesObserving Deep-SkyObjects Celestial Observing StarHopping40 Celestial Observing Seeing Viewing ConditionsTransparency Sky Illumination42 Celestial Observing Celestial Photography C E L E S T I A L P H O T O G R A P H YQuarter Short Exposure Prime FocusLunar Phase CrescentCelestial Photography 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 contrast46 Celestial Photography PiggybackCelestial Photography Ektar 1000 color print Konica 3200 color print48 Celestial Photography Projection 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 Super Modified Achromatic SMA Eyepieces 50 Optional AccessoriesO P T I O N A L A C C E S S O R I E S Dual Axis Drive System - #93523Optional Accessories Motor Drive System - #93518 52 Optional AccessoriesType THEMESSIERCATALOGNGC# ConstProper Name NGC#Const TypeProper Name NGC#Const TypeConstellation LIST OF BRIGHT STARSEpoch Star NameGeneral Observational Astronomy FOR FURTHER READINGAstronomy Texts AtlasesCELESTRON ONE YEAR WARRANTY Item #21017-INST Price $10.00 Celestron International 2835 Columbia StreetTorrance, CA Tel Fax