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The eyepiece, is the optical element that magnifies the image focused by the telescope. The eyepiece fits into either the visual back
directly or the star diagonal. To install the eyepiece:
1. Loosen the thumbscrew on the star diagonal so it does not obstruct the inner diameter of the eyepiece end of the diagonal.
2. Slide the chrome portion of the eyepiece into the star diagonal.
3. Tighten the thumbscrew to hold the eyepiece in place.
To remove the eyepiece, loosen the thumbscrew on the star diagonal and slide the eyepiece out.
Eyepieces are commonly referred to by focal length and barrel diameter. The focal length of each eyepiece is printed on the eyepiece
barrel. The longer the focal length (i.e., the larger the number) the lower the eyepiece power or magnification; and the shorter the focal
length (i.e., the smaller the number) the higher the magnification. Generally, you will use low-to-moderate power when viewing. For
more information on how to determine power, see the section on “Calculating Magnification.”
Barrel diameter is the diameter of the barrel that slides into the star diagonal or visual back. The CPC uses eyepieces with a standard
1-1/4" barrel diameter.
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The CPC telescope comes with an 8x50 finderscope. The specifications for a finderscope stand for the magnification and the
aperture, in millimeters, of the scope. So, an 8x50 finder magnifies objects eight times and has a 50mm objective lens.
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The finderscope must first be mounted in the included quick-release bracket then attached to the rear cell of the telescope. To
install the finderscope:
1. Locate the finderscope mounting bracket attached to the bottom portion of the finder bracket. Loosen the two thumb screws
to slide the mounting bracket from the finderscope bracket.
2. Find the two holes in the rear cell of the telescope on the top left, when looking from the back of the tube.
3. Place the mounting bracket over the two holes of the rear cell as shown in the figure 3-7.
4. Insert the screws through the bracket and into the rear cell.
WARNING: If you remove the mounting bracket, do not completely thread the screws back into the rear cell of the telescope. The
screws may be long enough to obstruct the movement of, and possibly damage the primary mirror.
Figure 3-7
The finderscope bracket comes in two pieces; the mounting bracket (left) and the finder bracket (right)
Figure 3-6
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