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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.
Newtonian collimation views as seen through the focuser using the collimation cap
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.
Collimation
Adjustment
Knobs
Mirror Support
Screws
Secondary mirror needs
adjustment
Primary mirror needs
adjustment
Secondary
mirror
Primary mirror
Mirror Clip
Both mirrors aligned with the
collimating cap in the focuser
Both mirrors aligned with your eye
looking into the focuser