Celestron 21035 User Manual
Page 7
7
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The diagonal is a prism that diverts the light at a right angle to the light path of
the telescope. This allows you to observe in a position that is more comfortable
than if you had to look straight through. The Travel Scope diagonal is an erect
image model that corrects the image to be right side up and oriented correctly
left-to-right which is much easier to use for terrestrial observing. Also, the
diagonal can be rotated to any position which is most favorable for you. To
install the diagonal and eyepiece:
1. Make sure the two thumbscrews on the rear of the telescope tube do not
protrude into the opening before installation, the plug up cap is removed
from the opening at the rear of the telescope tube, and the caps are removed
from the barrels on the diagonal. Insert the small barrel of the diagonal all
the way into the rear opening of the telescope tube (Figure 2-12). Then
tighten the two thumbscrews.
2. Put the chrome barrel end of one of the eyepieces into the diagonal (Figure
2-13) and tighten the thumb screw. When doing this make sure the
thumbscrew is not protruding into the diagonal before inserting the eyepiece.
3. The eyepieces can be changed to other focal lengths by reversing the
procedure in step 2 above.
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To install the Finderscope:
1. Locate the Finderscope (it will be mounted in the Finderscope bracket) – see Figure 1-1.
2. Remove the knurled nuts on the threaded posts on the telescope tube – see Figure 2-14.
3. Mount the Finderscope bracket by placing it over the posts protruding from the optical
tube and then holding it in place thread on the knurled nuts and tightening them down –
see Figure 2-15.
4
Note that the Finderscope should be oriented so that the larger diameter lens is facing
toward the front of the telescope tube.
5. Remove the lens caps from both ends of the Finderscope.
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Use the following steps to align the Finderscope:
1. Locate a distant daytime object and center it in the low power (20mm) eyepiece in the main
telescope.
2. Look through the Finderscope (the eyepiece end of the Finderscope) and take notice of the position of the same
object.
3. Without moving the main telescope, turn the adjustment thumbscrews located around the Finderscope bracket
until the crosshairs of the Finderscope are centered on the object chosen with the main telescope.
4. If the image through the Finderscope is out of focus, rotate the eyepiece of the Finderscope for a clear view.
Note: Objects viewed through a Finderscope are upside down and backwards which is normal.
Figure
2-16
Objective Lens
Eyepiece
Adjustment Screws
Figure 2-14
Figure 2-12
Figure 2-13
Figure 2-15