Celestron C4.5 User Manual

Installing the Eyepiece The eyepiece, or ocular as it is also called, is an optical element that magni-
fies the image focused by the telescope. Without the eyepiece it would be
impossible 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-
moderate 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 C4.5 uses
eyepieces with a barrel diameter of 1-1/4".
Eyepiece
Holder D
! f Figure 2-10
12 + Assembling Your C4.5

Celestron C4.5 Specifications

General

Brand	Celestron
Model	C4.5
Category	Telescope
Language	English