9
Figure 2-17
Dec. Lock Knob on top of Dec. circle &
R.A. Lock Knob on top of R.A. circle
Figure 2-18
Mounting Knob & Safety Screw in the dovetail bracket
Shown is the 114 EQ telescope tube
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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 2-19. 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.
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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”. The eyepiece fits directly into the focuser of the
Newtonians. 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 2-20.
2. The 20mm eyepiece is called an erecting eyepiece since it corrects the
image so it is right side up and corrected left to right. This makes the
telescope useful for terrestrial viewing.
3. The eyepieces can be changed by reversing the procedure as described
above.
Figure 2-19
Figure 2-20
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