Celestron 31056 S E M B L I N G Y O U R N E W T O N I a N T E L E S C O P E, Unpacking Your G-8N

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A S S E M B L I N G Y O U R N E W T O N I A N T E L E S C O P E

Unpacking Your G-8N

This section covers the proper assembly instructions for your G-8N and C150-HD reflecting telescope. These telescopes are Newtonian reflector that utilize mirrors with specific focal lengths. The telescope comes on the German equatorial mount, which when properly aligned and fitted with the optional motors, will track objects as they move across the sky. Each telescope contains the following standard accessories. Included are:

20mm Eyepiece 1-1/4"

6x30mm Finder (Model #31056)

9x50mm Finder (Model #31058)

Quick Release Finder Bracket

Lens Cap

CG-4 German Equatorial Mount (Model #31056)

CG-5 German Equatorial Mount (Model #31058)

Counterweight Bar

Counterweight (5 kg for Model #31058 - 3.6kg and 1.8kg for Model #31056)

Declination (DEC) Slow Motion Knob

Right Ascension (R.A.) Slow Motion Knob

Adjustable Aluminium Tripod

Accessory Tray

When setting up the telescope, find a large, clear area where the parts can be laid out without fear of losing them. Start with the tripod and mount. Remove the contents of the box and place them neatly on your work surface. Leave the optical tube in its box until you are ready to attach it to the mount. Once your telescope has been unpacked and assembled, you will not need the shipping boxes for everyday storage and transportation. However, you should save them in case you decide to ship your telescope via a common carrier.

8 • The C150-HD

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Contents C150-HD and G-8N Newtonian Page B L E N T E N T S Celestial Photography T R O D U C T I O N How to Use this Manual Word of Caution Newtonian Optical System S E M B L I N G Y O U R N E W T O N I a N T E L E S C O P E Unpacking Your G-8NG-8N C150-HD Setting Up the Tripod Adjusting the Tripod HeightAttaching the Accessory Tray Attaching the Equatorial Mount They are needed later for polar alignmentAttaching the R.A. Slow Motion Knob Attaching the Declination Slow Motion Knob Attaching the Counterweight Bar and Counterweight Attaching the Telescope to the Mount For G-8N Attaching the Telescope to the Mount For C150- HD Removing the Lens Cap Balancing the Telescope in R.ABalancing the Telescope in DEC CompletelyG-8N C150-HD Installing the Finderscope Installing the Eye- piece Technical Specifications Image Orientation ActualVeiw NewtonianViewFocusing Aligning the Finder Your First Look Daytime ObservingNighttime Observing Calculating Magnification Determining Field of View T R O N O M Y B a S I C S Celestial Coordi- nate SystemMotion of the Stars Polar Alignment DefinitionFinding the Pole Latitude Scales Pointing at Polaris Declination Drift Aligning the R.A Setting Circle Polar Alignment FindersL E S T I a L O B S E R V I N G Observing the Moon PlanetsObserving the S u n Observing Deep-Sky ObjectsUsing the Setting Circles Star Hopping Celestial Observing Viewing Conditions TransparencySky Illumination SeeingCelestial Observing L E S T I a L P H O T O G R a P H Y Lunar Phase ISO Crescent Quarter 125 Full 250 Short Exposure Prime F o c u sPiggyback Celestial Photography Care and Cleaning of the Optics Collimation L E S C O P E M a I N T E N a N C EOr back out the holder screws more than one 1 to two 2 turns T I O N a L a C C E S S O R I E S Optional Accessories Single Axis Motor Drive System #93518 Themessiercatalog Great Orion Nebula Elliptical Galaxy List of Bright Stars For Further Reading Celestron ONE Year Warranty