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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.
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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). Generally, you will use low-to-moderate power when viewing. For more information on how to determine
power, see the section on "Calculating Magnification".
1. Put the chrome barrel end of the 40mm 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.
2. The eyepieces can be changed to other focal lengths by reversing the procedure in step 2 above.
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To align the finderscope with the telescope you must first mount the
finderscope to the telescope. To install the finderscope:
Slide the finder bracket (attached to the finderscope) into the
1.
mounting bracket on the telescope.
The finderscope bracket will slide in from the back. The finderscope
2.
should be oriented so that the objective (larger) lens is toward the
front end of the telescope.
Tighten the set screw on the mounting bracket to hold the
3.
finderscope in place.
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Accurate alignment of the finder makes it easy to find objects with the telescope, especially celestial objects. To
make aligning the finder as easy as possible, this procedure should be done in the daytime when it is easy to find and
identify objects. The finderscope has a spring-loaded adjustment screw that puts pressure on the finderscope while
the remaining screws are used to adjust the finder horizontally and vertically. To align the finder:
1
Choose a target that is in excess of one mile away. This eliminates any possible parallax effect between the
telescope and finder.
2
Release the mounts locking clamps and point the telescope at your target.
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Figure 2-13 – Diagonal with Eyepiece
7
Figure 2-14
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