Assembling Your Celestron C5 Spotting Scope • 5
The Eyepiece
The eyepiece, or ocular, is the optical element that magnifies the image focused by
the spotting scope. The eyepiece fits into either the visual back directly or the erect
image diagonal. To install an ocular:
1. Loosen the thumbscrew on the star diagonal (or erect image 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 (or erect
image 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 diagonal or visual
back. The C5 spotting scope use eyepieces with a standard 1-1/4" barrel diameter.
2. Slide the chrome portion of the diagonal into the visual back.
3. Tighten the thumbscrew on the visual back to hold the diagonal in place.
If you wish to change the orientation of the diagonal, loosen the thumbscrew on the
visual back until the diagonal rotates freely. Rotate the diagonal to the desired
position and tighten the thumbscrew.
Figure 1-1
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