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INSTALLING THE DIAGONAL & EYEPIECES ( REFRACTOR)
The diagonal is a mirror assembly 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.
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.
INSTALLING THE EYEPIECES ON THE NEWTONIANS
The eyepiece (or ocular) is an optical element that magnifies the image
focused by the telescope. Without the eyepiece it would be impossible
to use the telescope visually. Eyepieces are commonly referred to by
focal length and barrel diameter. The longer focal length (i.e., the larger
the number) the lower the eyepiece magnification (i.e., power). Gen-
erally, you will use low-to-moderate power when viewing. For more
information on how to determine power, see the section on “Calculating
Magnication”. The eyepiece ts directly into the focuser of the Newto-
nians. To attach the eyepieces:
1. Make sure the thumbscrews are not protruding into the focuser tube.
Then, insert the chrome barrel
of the eyepieces into the focus tube (remove the plug up cap of the
focuser first) and tighten the thumbscrews – see Figure 2-14.
2. The eyepieces can be changed by reversing the procedure as described above.
8
Figure 2-13
Figure 2-14
8


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