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Celestron CR-150 HD instruction manual The CR-150HD

Models: CR-150 HD

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The CR-150 HD

The CR-150 HD

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	Figure 2-1
1. Lens Cap (not shown)	9. Leg Extension Clamp
2. Dovetail Slidebar	10. Latitude Adjustment Screw
3. Declination Lock	11. Focus Knobs
4. Declination Setting Circle	12. Eyepiece
5. Counterweight Shaft	13. Finderscope Bracket
6. Counterweights	14. Finderscope
7. Tripod Leg	15. Tube Mounting Rings
8. Accessory Tray	16. Optical Tube

8 • The CR-150 HD

Image 8

Celestron CR-150 HD instruction manual The CR-150HD

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 Setting Up the Tripod Adjusting the Tripod Height Assembling the CG-5Equatorial MountTripod Head The CR-150HDAttaching the Accessory Tray 10 The CR-150HDAttaching the Equatorial Mount The CR-150HDAttaching the R.A. Slow Motion Knob 12 The CR-150HDAttaching the Declination Slow Motion Knob The CR-150HD1.Lock the DEC clamp to hold the mount in place 14 The CR-150HDTube Rings Dovetail Bracket Attaching the Telescope to the MountThe CR-150HD Balancing the Telescope in R.A 16 The CR-150HDThe CR-150HD Balancing the Telescope in DECCOMPLETELY 18 The CR-150HD Adjusting the Mount in AltitudeAdjusting the Mount in Azimuth Technical Specifications Disassembling and Transporting Your CR 150 HDStoring Your CR- 150 HD OPTICAL TUBEAttaching the Accessories T E L E S C O P E B A S I C SThe Star Diagonal The Eyepiece1 1/4 Accessory Focuser TensionAdapter Built-inT-Adapter22 Telescope Basics FocusingAttaching the Finder Aligning the Finder Telescope BasicsImage Orientation YourFirstLookDaytimeObserving NEVER POINT YOUR TELESCOPE AT THE SUN UNLESSNighttime Observing Telescope Basics •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.” Telescope Basics28 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 BasicsPolar Alignment EquatorDefinition 30 Astronomy BasicsAstronomy Basics Finding the PoleDefinition Latitude Scales 32 Astronomy BasicsPointingatPolaris Astronomy BasicsDeclinationDrift 34 Astronomy BasicsAstronomy Basics Aligning the R.A Setting CirclePolar Alignment Finders Observing the Moon Observing thePlanets C E L E S T I A L O B S E R V I N GUsing the Lens Cap Aperture Stop Observing the SunSOLAROBSERVINGHINTS Celestial Observing38 Celestial Observing Using the Setting CirclesObserving Deep-SkyObjects StarHopping Celestial Observing40 Celestial Observing Viewing Conditions TransparencySky Illumination Seeing42 Celestial Observing C E L E S T I A L P H O T O G R A P H Y Celestial PhotographyShort Exposure Prime Focus Lunar PhaseCrescent 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 Celestial PhotographyPiggyback 46 Celestial PhotographyEktar 1000 color print Konica 3200 color print Celestial PhotographyProjection 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 50 Optional Accessories O P T I O N A L A C C E S S O R I E SDual Axis Drive System - #93523 Super Modified Achromatic SMA EyepiecesOptional Accessories 52 Optional Accessories Motor Drive System - #93518THEMESSIERCATALOG NGC#Const TypeNGC# ConstType Proper NameNGC# ConstType Proper NameLIST OF BRIGHT STARS EpochStar Name ConstellationFOR FURTHER READING Astronomy TextsAtlases General Observational AstronomyCELESTRON ONE YEAR WARRANTY Item #21017-INST Price $10.00 Celestron International 2835 Columbia StreetTorrance, CA Tel Fax