Manual Celestron AstroMaster 70 EQ (page 28 of 31) (English)

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With Polaris or a bright star centered within the field of view, focus with either the standard ocular or your highest

power ocular, i.e. the shortest focal length in mm, such as a 6mm or 4mm. Another option is to use a longer focal

length ocular with a Barlow lens. When a star is in focus it should look like a sharp pinpoint of light. If, when

focusing on the star, it is irregular in shape or appears to have a flare of light at its edge, this means your mirrors aren’t

in alignment. If you notice the appearance of a flare of light from the star that remains stable in location, just as you

go in and out of exact focus, then re-collimation will help sharpen the image.

When satisfied with the collimation, tighten the small locking screws

Take note of the direction the light appears to flare. For example, if it appears to flare toward the three o'clock

position in the field of view, then you must move whichever screw or combination of collimation screws

necessary to move the star’s image toward the direction of the flaring. In this example, you would want to move

the image of the star in your eyepiece, by adjusting the collimation screws, toward the three o'clock position in the

field of view. It may only be necessary to adjust a screw enough to move the star’s image from the center of the

field of view to about halfway, or less, toward the field's edge (when using a high power ocular).

Collimation adjustments are best made while viewing the star's position in the

field of view and turning the adjustment screws simultaneously. This way, you

can see exactly which way the movement occurs. It may be helpful to have two

people working together: one viewing and instructing which screws to turn and

by how much, and the other performing the adjustments.

IMPORTANT: After making the first, or each adjustment, it is necessary to re-

aim the telescope tube to re-center the star again in the center of the field of

view. The star image can then be judged for symmetry by going just inside and

outside of exact focus and noting the star's pattern. Improvement should be seen if

the proper adjustments are made. Since three screws are present, it may be

necessary to move at least two to achieve the necessary mirror movement.

Figure 7-2

Even though the star pattern appears the same on both sides of focus, they are asymmetric. The

dark obstruction is skewed off to the left side of the diffraction pattern indicating poor

collimation.

Figure 7-3

A collimated

telescope should

appear as a

symmetrical ring

pattern similar to the

diffraction disk seen

here.

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Celestron AstroMaster 70 EQ Manual

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