Orion #27189 XT12I, #27183 XT8I, #27182 XT6I Installing the Finder Scope, Inserting an Eyepiece

		Nylon	Eyepiece
		alignment
Objective	Finder	thumbscrew
		(2)
lens cell	scope
	bracket

	Correct-Image
Focusing	prism housing
lock ring	Tensioner

Figure 12a. The 9x50 right-angle correct-image finder scope and bracket (6x30 for the XT6i).

Knurled thumbscrew

Finder scope bracket Dovetail holder

Figure 12b. Inserting the finder scope into its dovetail holder.

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.

2" eyepiece adapter 1.25" eyepiece adapter

Focus knobs

Focus lock

thumbscrew

Focusing tension adjustment set screw

Figure 13a. The 2" Crayford focuser of the SkyQuest XT8i, XT10i, and XT12i.

Focus knobs

Focus lock thumbscrew

Focusing tension adjustment set screws

Figure 13b. The 1.25" rack-and-pinion focuser of the SkyQuest XT6i.

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

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