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Celestron CGEM 1100 Manual

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The CGEM 800 and 925 telescopes come with a 6x30 finderscope used to help you locate and center objects in the main field
of your telescope. To accomplish this, the finder has a built-in cross-hair reticle that shows the optical center of the
finderscope. The CGEM 1100 comes with a 9x50 finderscope.
Start by removing the finder and hardware from the plastic wrapper. Included are the following:
• Finderscope
• Finder Bracket
• Rubber O-ring
• Three Nylon Thumbscrews (10-24x1/2")
• Two Phillips Head Screws (8-32x1/2")
To install the finderscope:
1. Attach the bracket to the optical tube. To do this, place the curved
portion of the bracket with the slot over the two holes in the rear
cell. The bracket should be oriented so that the rings that hold the
finder are over the telescope tube, not the rear cell (see Fig 2-9).
Start threading the screws in by hand and tighten fully with an
Allen wrench.
2. Partially thread-in the three nylon thumbscrews that hold the finder
in place inside the bracket. Tighten the screws until the nylon
heads are flush with the inner diameter of the bracket ring. Do
NOT thread them in completely or they will interfere with the
placement of the finder. (Having the screws in place when the
finder is installed will be easier than trying to insert the screws
after the finder has been installed.)
3. Slide the rubber O-ring over the back of the finder (it will NOT fit over the
objective end of the finder). It may need to be stretched a little. Once on the main body of the finder, slide it up about
one inch from the end of the finder.
4. Rotate the finder until one cross hair is parallel to the R.A. axis and the other is parallel to the DEC axis.
5. Slide the eyepiece end of the finder into the front of the bracket.
6. Slightly tighten the three nylon thumbscrews on the front ring of the bracket to hold the finder in place.
7. Once on, push the finder back until the O-ring is snug inside the back ring of the finder bracket.
8. Hand tighten the three nylon tipped thumbscrews until snug.
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The CGEM 1100 telescope comes with a 9x50 finderscope. The specifications for a finderscope stand for the magnification and the
aperture, in millimeters, of the scope. So, a 9x50 finder magnifies objects eight times and has a 50mm objective lens.
Finderscope Installation
The finderscope must first be mounted in the included quick-release bracket then attached to the rear cell of the telescope.
To install the finderscope:
1. Locate the finderscope mounting bracket attached to the bottom portion of the finder bracket. Loosen the two thumb
screws to slide the mounting bracket from the finderscope bracket.
2. Find the two holes in the rear cell of the telescope on the top left, when looking from the back of the tube.
Figure 2-11
Finderscope
Nylon
Adjustment
Screw
Finder Bracket
Rear Cell
Figure 2-9
… 11 …


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