Celestron NexStar 102SLT Quick Setup Manual page 4

Aligning the
Finderscope
The finder is one of the most important parts of your
telescope. It helps you locate objects and center
them in the eyepiece. The first time you assemble
your telescope, you need to align the finder to the
telescope's main optics. It's best to do this during
the day*.
*SOLAR WARNING! Never attempt to view
the Sun through any telescope without a
proper solar filter!
3
LOOK THROUGH FINDERSCOPE
Once the object is centered in your 25mm eyepiece,
look through the finderscope and locate the red dot.
Your First Night
Out: The Moon
The best and easiest target for you to try to view
first is the Moon. Try observing the Moon at different
points in its phase cycle. The best time to view the
Moon is from two days after a New Moon up to a few
days before a Full Moon. During this period, you will
be able to see the most detail in the craters and lunar
mountain ranges.
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1
CHOOSE A TARGET
Take the telescope outside during the day and find
an easily recognizable object, such as a streetlight,
car license plate or sign. The object should be as far
away as possible, but at least a quarter mile away.
4
ADJUST THE FINDERSCOPE
Without moving the telescope, use the two
adjustment knobs to move the finder around until
the red dot appears over the same object you are
observing in the telescope's 25mm eyepiece.
1
With the Moon visible in the sky, set up your
telescope as described above with the 25mm
eyepiece installed.
2
25mm
Eyepiece
Focus Knob
CENTER THE TARGET IN THE EYEPIECE
Look through the telescope using your lower
powered eyepiece. Move the telescope until the
object you chose lies in the center of the view. If the
image is blurry, gently turn the focus knob until it
comes into sharp focus. NOTE: The image in your
telescope may appear inverted. This is perfectly
normal in an astronomical telescope.
5
YOUR FINDERSCOPE IS NOW ALIGNED!
It should not require realignment unless it is bumped
or dropped.
2
Move the telescope so that it is roughly pointing
toward the Moon.