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3

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.

Aligning the Finder Scope

Accurate  alignment  of  the  finder  scope  makes  it  easy  to 
find objects with the telescope, especially celestial objects. 
To make aligning the finder as easy as possible, this proce-
dure should be done in the daytime when it is easy to find 
and identify objects. The finder scope has two perpendicular 
adjustment screws and a spring-loaded pin that allow easy 
adjustment of the finder scope horizontally and vertically. To 
align the finder:

Figure 3a. 

Attaching the optional dovetail finder scope base.

Figure 3b.

 The Orion 6x30 finder scope.

Tensioner

Eyepiece

Dovetail 

foot

Finder-scope 

bracket

Focus 
lock ring

Alignment 
thumbscrews

Objective lens

Figure 3c.

 

Pull the spring-
loaded tensioner 
outward, then 
insert the finder 
scope into the 
finder scope 
bracket.

Summary of Contents for Telescope

Page 1: ... 8 05 Providing Exceptional Consumer Optical Products Since 1975 Customer Support 800 676 1343 E mail support telescope com Corporate Offices 831 763 7000 P O Box 1815 Santa Cruz CA 95061 Orion Schmidt Cassegrain Telescopes 8 9 25 11 ...

Page 2: ...iameter of the visual back 2 Slide the chrome portion of the star diagonal into the visu al back Tighten the set screw on the visual back to hold the star diag onal in place 2 Congratulations on your purchase of an Orion Schmidt Cassegrain telescope The Schmidt Cassegrain opti cal system uses a combination of mirrors and lenses and is referred to as a compound or catadioptric telescope This unique...

Page 3: ...oles 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 ...

Page 4: ...us on a closer object and counterclockwise for a more distant object A single turn of the focusing knob moves the primary mirror only slightly Therefore it will take many turns about 30 to go from close focus to infinity For astronomical viewing out of focus star images are very diffuse making them difficult to see If you turn the focus knob too quickly you can go right through focus without seein...

Page 5: ...bulb Then use an optical cleaning solution and white tissue paper to remove any remaining debris Apply the solution to the tissue not to the glass and then apply the tissue paper to the lens Low pres sure strokes should go from the center of the corrector to the outer portion Do NOT rub in circles You can use a commercially made lens cleaner or mix your own A good cleaning solution is isopropyl al...

Page 6: ...use an Allen wrench to turn the collimation screw you located in steps 2 and 3 Usually a tenth of a turn is enough to notice a change in collimation If the star image moves out of the field of view in the direction that the central shadow is skewed then you are turning the collimation screw the wrong way Turn the screw in the opposite direction so that the star image is moving toward the center of...

Page 7: ...7 ...

Page 8: ...erves the right to replace any product which has been discontinued from its product line with a new product of comparable value and function This warranty shall be void and of no force of effect in the event a covered product has been modified in design or function or subjected to abuse misuse mishandling or unauthorized repair Further product malfunction or deterioration due to normal wear is not...

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