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9 I
inStalling the diagonal & eyepieceS
The diagonal is a prism that diverts the light at a right angle to the light path of the refractor. This allows you to observe in
a position that is more comfortable than if you looked straight through. This 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 eyepieces:
1. Insert the small barrel of the diagonal into the 1.25” eyepiece adapter of the focus tube on the refractor – Figure 2-13.
Make sure the two thumbscrews on the eyepiece adapter do not protrude into the focuser tube before installation and
the plug up cap is removed from the eyepiece adapter.
2. Put the chrome barrel end of one of the eyepieces into the diagonal and tighten the thumb screw. Again, when doing
this make sure the thumb screw 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.
Figure 2-13
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