Celestron 22066 AstroMaster LT Manual

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16 I ENGLISH

Collimation is a painless process and works like this:

Pull off the lens cap which covers the front of the telescope and look down the optical tube. At the bottom you will see the pri-

mary mirror held in place by three clips 120º apart, and at the top the small oval secondary mirror held in a support and tilted 45º

toward the focuser outside the tube wall.

The secondary mirror is aligned by adjusting the three smaller screws surrounding the central bolt. The primary mirror is adjusted

by the three adjusting screws at the back of your scope. The three locking screws beside them serve to hold the mirror in place

after collimation.

COLLIMATION OF A NEWTONIAN TELESCOPE

While your telescope requires little maintenance, there are a few things to remember that will ensure your telescope

performs at its Collimation is the process of aligning the mirrors of your telescope so that they work in concert with each

other to deliver properly focused light to your eyepiece. By observing out-of-focus star images, you can test whether your

telescope’s optics are aligned. Place a star in the center of the ﬁeld of view and move the focuser so that the image is

slightly out of focus. If the seeing conditions are good, you will see a central circle of light (the Airy disc) surrounded by a

number of diffraction rings. If the rings are symmetrical about the Airy disc, the telescope’s optics are correctly collimated.

Correctly Aligned Needs Collimation

Primary Mirror

Secondary Mirror

Support for

secondary mirror

Focuser

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Celestron 22066 AstroMaster LT 60AZ Telescope with Phone Adapter and Moon Filter