Aligning The Finder Scope - Orion Telescope Instruction Manual

Telescopes 8", 9.25", & 11"

Hide thumbs

Table of Contents

Inserting an Eyepiece

An eyepiece magnifies the image focused by the telescope.

The eyepiece fits into either the visual back directly or the star

diagonal. To install an eyepiece:

1. Loosen the set screw on the star diagonal until the tip no

longer extends into the inner diameter of the eyepiece end

of the diagonal.

2. Slide the chrome portion of the eyepiece into the star diag-

onal.

3. Tighten the set screw on the star diagonal to hold the eye-

piece in place.

To remove the eyepiece, loosen the setscrew on the star

diagonal and slide the eyepiece out. You can replace it with

another eyepiece (purchased separately).

Eyepieces are commonly referred to by focal length and bar-

rel diameter. The focal length of each eyepiece is printed on

the eyepiece barrel. The longer the focal length (i.e., the larger

the number) the lower the eyepiece magnification, the shorter

the focal length (i.e., the smaller the number) the higher the

magnification. Generally, you will use low to moderate pow-

ers when viewing. For more information on how to determine

power, see the section on "Calculating Magnification."

Attaching a Finder Scope

A finder scope is a small, wide-field telescope used to help

locate and center objects in the field of your main telescope.

The finder scope has a built-in crosshair reticle that shows the

optical center of the finder's field of view.

1. To install an Orion finder scope, you must first attach a

dovetail finder scope base (#7215) to the telescope. Line

up the through-holes in the base with the threaded holes

in the rear cell of the telescope tube. Then insert the two

supplied screws through the base and thread them into

the telescope holes until secure (Figure 3a). Now you're

ready to attach the finder scope.

2. Unthread the two black nylon thumbscrews until the ends

are flush with the inside of the bracket (Figure 3b). Remove

the O-ring from the foot of the bracket and slide it 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. Slide it until

it seats into the slot in the middle of the finder tube.

3. Slide the eyepiece end (narrow end) of the finder scope

into the end of the bracket's cylinder opposite the align-

ment screws while pulling the chrome, spring-loaded ten-

sioner pin on the bracket with your fingers (Figure 3c).

Push the finder scope through the bracket until the O-ring

seats just inside the front opening of the bracket cylinder.

Release the tensioner pin and tighten the two black nylon

thumbscrews a couple of turns each to secure the finder

scope in place.

4. Now insert the foot of the finder scope bracket into the

dovetail base. Lock the bracket into position by tightening

the knurled thumbscrew on the dovetail holder.