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Celestron Omni XLT 150 Manual

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To install the finderscope onto the telescope you must first mount the finderscope through the finder bracket and
then attach it to the telescope. Toward the rear of the telescope tube (on refractors and Schmidt-Cassegrain) and
front of the telescope tube (Newtonian), there is a small bracket with a set screw in it. This is where the finderscope
bracket will be mounted. To install the finderscope:
1. Loosen the finderscope adjustment screws so
they don’t protrude into the bracket. Then
slide the rubber O-ring over the eyepiece end
of the finderscope (smallest diameter side) and
roll it 2/3 of the way up into the slot (groove)
in the finderscope.
2. Insert the eyepiece end of the finderscope
through the narrow part of the bracket until the
O-ring presses tightly between the finder and
the inside of the bracket. Once it stops, then
pull outward on the spring loaded adjustment
screw and continue inserting the finderscope
until it is approximately centered in the
bracket.
3. Tighten the two adjustment screws until they
make contact with the finderscope body.
4. Locate the mounting bracket near the front (open) end of the telescope.
5. Loosen the set screw on the mounting bracket on the telescope so it
does not protrude into the bracket.
6. Slide the finder bracket (attached to the finderscope) into the mounting bracket on the telescope.
7. The finderscope bracket will slide in from the back. The finderscope should be oriented so that the
objective lens is toward the front (open) end of the telescope.
8. Tighten the set screw on the mounting bracket to hold the finderscope in place.
For information on aligning your finderscope, see the Telescope Basics section of this manual.
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Only applicable to the Schmidt-Cassegrain, the Visual Back is the accessory that allows you to attach all visual
accessories to the telescope. The Omni Schmidt-Cassegrain normally comes with the Visual Back installed. If in
case it is not installed, follow these instructions for attaching it:
1. Remove the cover on the rear cell and then place the knurled slip ring on the Visual Back over the threads
on the rear cell (Fig 2-11).
2. Hold the Visual Back with the set screw in a convenient position and rotate the knurled slip ring clockwise
until tight. Once this is done, you are ready to attach other accessories, such as diagonals (for refractors
and the Schmidt-Cassegrain), eyepieces, etc. If you want to remove the Visual Back, rotate the slip ring
counterclockwise until it is free of the rear cell.
Finderscope
Finder
Bracket
Mounting
Bracket
Set
Screw
Figure 2-10
… 13 …


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