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fixed optical systems that should not come out of collimation. The
LCM 76, and 114 however has three collimation screws that can
be used to adjust the alignment of the primary mirror.
To check if your telescope is in collimation the following
diagram will help you. If you look into the eyepiece adapter
(withoutaneyepiece)atthetopofthefocuser,thisiswhat
you should see. If the reflection of your eye is off center, then
collimation is necessary.
Aligning the Secondary Mirror
The following describes the procedure for daytime collimation
of your telescope using the optional Newtonian Collimation
Tool(#94182)offeredbyCelestron.
If you have an eyepiece in the focuser, remove it. Using the
focusing knobs, rack the focuser tube in completely. You will
be looking through the focuser at a reflection of the secondary
mirror, projected from the primary mirror. During this step,
ignore the silhouetted reflection from the primary mirror. Insert
the collimating cap into the focuser and look through it. With
the focus pulled in all the way, you should be able to see the
entire primary mirror reflected in the secondary mirror. If the
primary mirror is not centered in the secondary mirror, adjust
the secondary mirror screws by alternately tightening and
loosening them until the periphery of the primary mirror is
centered in your view. DO NOT loosen or tighten the center
screw in the secondary mirror support, because it maintains
proper mirror position.
Aligning the Primary Mirror
Now adjust the primary mirror screws to re-center the reflection
of the small secondary mirror, so its silhouetted against the view
of the primary. As you look into the focuser, silhouettes of the
mirrors should look concentric. Repeat steps one and two until
you have achieved this. Remove the collimating cap and look
into the focuser, where you should see the reflection of your
eye in the secondary mirror.
Adjustments to the collimation of the telescope can be made
by turning the collimation adjustment knobs located at the rear
of the optical tube. First loosen the three Phillips head screws
on the rear cell of the tube. Turn each collimation knobs, one at
a time, until the reflected image of your eye in the secondary
mirror is centered in the primary mirror. Once the telescope
is collimated, tighten the Phillips head screws until you feel a
slight resistance. Do not over tighten the screw.
If your telescope is out of collimation, the best way to re-
collimate it is with a good collimation tool. Celestron offers a
NewtonianCollimationTool(#94183)withdetailedinstructions
that make it an easy chore.
newToniAn coLLiMATion views As seen Through The Focuser using The coLLiMATion cAP
Secondary mirror
needs adjustment
Primary mirror
needs adjustment
Secondary
Mirror
Primary
Mirror
Mirror
Clip
Mirror Support
Screws
Collimation
Adjustment Knobs
Both mirrors
aligned with the
collimating cap in
the focuser
Both mirrors
aligned with your
eye looking into
the focuser
21


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