Orion XT12 - Manual (Page 9)

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now be known as the retaining knob. Push the shaft of the
retaining knob through the hole in the side panel opposite
the one the retaining knob is in (Figure 18). Thread the
knob into the altitude bearing as far as it will go. There will
be a gap of about 1/2" between the side panel and the
altitude bearing; this is where the altitude encoder of the
IntelliScope object locator will go.
The CorrecTension system is now installed. If you wish to
remove the optical tube from the base, you will first need to
unthread and remove both the knobs.
Installing the Finder Scope
SkyQuest IntelliScope Dobsonians come with a high-qual-
ity, large-aperture 9x50 achromatic crosshair finder scope
(Figure 19a) as standard equipment. This greatly aids in find-
ing objects to view in the night sky.
To place the finder scope in the finder scope bracket, first
unthread the two black nylon screws until the ends are flush
with the inside of the bracket. Place the rubber O-ring that
comes on the base of the bracket over the body of the finder
scope until it seats into the slot on the middle of the finder
scope. Slide the eyepiece end (narrow end) of the finder scope
into the bracket as shown while pulling the chrome, spring-
loaded tensioner on the bracket with your fingers (Figure
19b). Push the finder scope through the bracket until the O-
ring seats just inside the front opening of the bracket. Now,
release the tensioner and tighten the two black nylon screws
a couple of turns each to secure the finder scope in place.
Insert the base of the finder scope bracket into the dovetail
holder located adjacent to the telescope's focuser. Lock the
bracket into position by tightening the knurled thumbscrew on
the dovetail holder.
Inserting an Eyepiece
The final step in the assembly process is to insert an eye-
piece into the telescope’s focuser. First, take the cover cap off
the focuser drawtube.
Loosen the thumbscrew on the 1.25" eyepiece adapter
(Figure 20). Do not loosen the two thumbscrews on the 2"
eyepiece adapter. Insert the supplied 25mm Sirius Plössl eye-
piece, and secure it by retightening the thumbscrew on the
Figure 18. The retaining knob with the nylon spacer is installed
on the side of the base that does not have the IntelliScope port.
Figure 19a. The 9x50 finder scope and bracket.
Tensioner
Eyepiece
Nylon
alignment
thumbscrew (2)
Focus lock ring
Finder scope Finder scope bracket
Figure 19b. Pull back on the tensioner and slide the finder scope
into its bracket until the O-ring is seated in the bracket’s ring.
O-ring
Figure 20. The 2” focuser of the SkyQuest XT12 IntelliScope.
Focus lock
thumbscrew
Focus
knobs
1.25"
eyepiece
adapter
2" eyepiece adapter
Collimation
screw pair (3)