Orion SKYQUEST #27189 XT12I - Manual (Page 10)

10
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. Once the optical tube
is removed from the base, thread the knobs back into the
altitude bearings so you do not lose them.
installing the Finder scope
SkyQuest IntelliScope Dobsonians come with a high-quality,
large-aperture 9x50 (6x30 for the XT6) right-angle correct-
image (RACI) achromatic crosshair finder scope
(Figure 12a)
as standard equipment. This greatly aids in finding objects to
view in the night sky.
The finder scope arrives pre-installed in its bracket, but must
be placed into the dovetail holder on the telescope tube. Insert
the base of the finder scope into the dovetail holder located
adjacent to the focuser
(Figure 12b). 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.
For the XT8i, XT10i, and XT12i: Loosen the thumbscrew
on the 1.25" eyepiece adapter
(Figure 13a). Do not loosen
the two thumbscrews on the 2" eyepiece adapter. Insert the
supplied 25mm Sirius Plössl eyepiece, then secure it by
retightening the thumbscrew on the 1.25" eyepiece adapter.
The other eyepiece can be placed in the eyepiece rack until
it is needed.
For the XT6i: Loosen the two thumbscrews on the eyepiece
holder and insert the 25mm Sirius Plössl eyepiece. Then
secure it in place with the thumbscrews
(Figure 13b). The
other eyepiece can be placed in the eyepiece rack until it is
needed.
The basic assembly of your SkyQuest IntelliScope Dobsonian
is now complete. It should appear as shown in
Figure 1. The
Figure 13a. The 2" Crayford focuser of the SkyQuest XT8i,
XT10i, and XT12i.
Focus knobs
2" eyepiece adapter
1.25" eyepiece adapter
Focus lock
thumbscrew
Focusing tension
adjustment set screw
Figure 13b. The 1.25" rack-and-pinion focuser of the SkyQuest
XT6i.
Focusing tension
adjustment set screws
Focus knobs
Focus lock
thumbscrew
Figure 12b. Inserting the finder scope into its dovetail holder.
Finder scope bracket
Knurled thumbscrew
Dovetail holder
Figure 12a. The 9x50 right-angle correct-image finder scope
and bracket (6x30 for the XT6i).
Tensioner
Eyepiece Nylon
alignment
thumbscrew
(2)
Focusing
lock ring
Objective
lens cell
Finder
scope
bracket
Correct-Image
prism housing