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4
INTRODUCTION
Congratulations on your purchase and welcome to the Celestron world of astronomy. If you’re a newcomer
to the hobby of astronomy, some of the terms and telescope components described in this instruction
manual may be new to you. This manual is designed to instruct you in the proper use of your Celestron C80-
HD Refractor, C102-HD Refractor, C114-HD 4.5 Newtonian or C150-HD Newtonian as well as the CG-4
Equatorial Mount. To assist you in assembling and operating your telescope, take time to review this
manual and the parts diagram listed in Figure 1.
WARNING—NEVER LOOK AT THE SUN WITH YOUR TELESCOPE OR ITS FINDERSCOPE.
PERMANENT AND IRREVERSIBLE EYE DAMAGE MAY RESULT AS WELL AS DAMAGE
TO YOUR TELESCOPE.
HOWEVER, YOU MAY ENJOY LOOKING AT THE SUN IF YOU HAVE A SAFE METHOD OF
DOING SO—A SOLAR FILTER. IF USING THE SOLAR FILTER, MAKE SURE THE
FINDERSCOPE IS COVERED.
TELESCOPE ASSEMBLY
The telescopes and all items are packed in one box. Included are:
• Telescope Optical Tube
• German Equatorial Mount
• Adjustable Aluminum Tripod
• 6x30 Finderscope and Bracket
• Counterweight Shaft and Counterweights (3.6 Kg and 1.8 Kg for reflector models #31027, #31056
and refractor model #21016; 3.6 kg only for refractor model #21077 and CG-4 Eq Mount #91510)
• Tripod Accessory Tray
• Declination Slow Motion Knob
• Right Ascension Slow Motion Knob
• 20mm Plossl Eyepiece
• 1 ¼" Mirror Diagonal (Except #31027 & #31056)
Setting Up the Tripod:
1. Locate the tripod head (see figure 1). Attach each leg one by one to the tripod head by aligning the
holes at the top of each leg with the holes in the tripod head. Slide a bolt through each of the legs and
the tripod head and secure at the other end with a wing nut. NOTE: this may have been pre-assembled
at the factory.
2. Now that the tripod legs are attached, stand the tripod up and spread the legs until the center leg
support is fully extended.
3. The equatorial mount, which holds the telescope, attaches to the tripod head. On one side of the tripod
head there is an “N” which signifies North. This side of the tripod will face north when setting up for
an astronomical observing session. Above the “N” is a metal peg about 3/4" high that points straight
up. Place the equatorial mount head on top of the tripod head so that the metal peg fits between the two