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24 • The C150-HD
The eyepiece, or ocular as it is also called, is an optical element that magnifies
the image focused by the telescope. Without the eyepiece it would be impos-
sible to use the telescope visually. The eyepiece fits directly into the eyepiece
holder. To attach an ocular:
1. Loosen the set screw on the eyepiece holder so that it does not obstruct the
inner diameter of the eyepiece holder.
2. Slide the chrome portion of the eyepiece into the eyepiece holder.
3. Tighten the set screw to hold the eyepiece in place.
To remove the eyepiece, loosen the set screw on the eyepiece holder and slide
the eyepiece out. You can replace it with another ocular.
Eyepieces are commonly referred to by focal length which is printed on the
eyepiece barrel. The longer the focal length (i.e., the larger the number) the
lower the eyepiece power and the shorter the focal length (i.e., the smaller the
number) the higher the magnification. Generally, you will use low-to-moder-
ate power when viewing. For more information on how to determine power,
see the section on “Calculating Magnification.”
In addition, eyepieces are also referred to by barrel diameter. The C150-HD and G-
8N use eyepieces with a barrel diameter of 1-1/4".
Once the telescope is fully assembled, tighten the bolts that hold the tripod legs to
the tripod head and the bolts that adjust the tripod height. Check these bolts
periodically to ensure they are tight. The first check should be done 24 hours after
initial assembly.
Installing the Eye-
piece
Figure 2-13