Manual Celestron AstroMaster 90AZ (page 21 of 26) (English)

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Figure 7-1

ight Time Star Collimating

fter successfully completing daytime collimation, night time star collimation can be done by closely

re beginning

ike the North Star (Polaris). It can

mary mirror, locate the collimation screws on the rear of the telescope tube.

ook into the focuser and notice if

he secondary reflection has moved closer to the center of the primary mirror.

Aligning the Primary Mirror

Now adjust the primary mirror screws to re-center the reflection of the small secondary mirror, so it’s 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.

adjusting the primary mirror while the telescope tube is on its mount and pointing at a bright star. The

telescope should be set up at night and a star's image should be studied at medium to high power (30-60

power per inch of aperture). If a non-symmetrical focus pattern is present, then it may be possible to

correct this by re-collimating only the primary mirror.

Procedure (Please read this section completely befo

To star collimate in the Northern Hemisphere, point at a stationary star l

be found in the north sky, at a distance above the horizon equal to your latitude. It’s also the end star in the

handle of the Little Dipper. Polaris is not the brightest star in the sky and may even appear dim, depending

upon your sky conditions

Prior to re-collimating the pri

The rear cell (shown in Figure 7-1) has three large thumbscrews which are used for collimation and three

small thumbscrews which are used to lock the mirror in place. The collimation screws tilt the primary

mirror. You will start by loosening the small locking screws a few turns each. Normally, motions on the

order of an

turn will make a difference, with approximately a

turn being the maximum required

for the large collimation screws. Turn one collimation screw at a time and with a collimation tool or

eyepiece see how the collimation is affected (see the following paragraph below). It will take some

experimenting but you will eventually get the centering you desire.

is best to use the optional collimation tool or collimating eyepiece. L

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Celestron AstroMaster 90AZ Manual

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