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THE EYEPIECE
The eyepiece is the optical element that magnifies the
image focused by the telescope The eyepiece fits directly
into the focuser To install the eyepiece:
Eyepiece
1 Loosen the thumbscrew on the focuser
2 Slide the chrome portion of the low power 25mm eyepiece
into the focuser
Thumbscrew
3 Tighten the thumbscrew to hold the eyepiece in place
To remove the eyepiece, loosen the thumbscrew on the
focuser and slide the eyepiece out
Eyepieces are commonly referred to by their 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 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" (page 10)
Barrel diameter is the diameter of the barrel that slides into the focuser The NexStar uses eyepieces
with a standard 1 25" barrel diameter
FOCUSING
The focusing knobs are on the telescope focuser located on the side of the tube, just below the eyepiece Turn the focusing
knob until the image is sharp If the knob will not turn, it has reached the end of its travel on the focusing mechanism Turn
the knob in the opposite direction until the image is sharp Once an image is in focus, turn the knob clockwise to focus on a
closer object and counterclockwise for a more distant object
For astronomical viewing, out of focus star images are very diffuse, making them difficult to see If you turn the focus
knob too quickly, you can go right through focus without seeing the image To avoid this problem, your first astronomical
target should be a bright object (like the Moon or a planet) so that the image is visible even when out of focus
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