Appendix: Collimating

Collimating is the process of aligning a telescope’s optics.Your Maksutov-Cassegrain's primary mirror was aligned at the fac‑ tory and should not need adjustment unless the telescope is handled roughly. This manual contains information on how to test the collimation of your telescope and instructions for prop‑ er alignment should that be needed.

Star-Testing the Telescope

Before you start adjusting the primary mirror of your telescope, make certain that it is actually out of collimation by performing a star test.

Take your telescope out at dusk and let it acclimate to the out‑ side temperature; this usually takes 30-60 minutes. When it is dark, point the telescope upwards at a bright star and accu‑ rately center it in the eyepiece’s field of view. Slowly de-focus the image with the focusing knob. If the telescope is correctly collimated, the expanding disk should be a circle (Figure 16). If the image is unsymmetrical, the scope is out of collimation. Also, the dark shadow cast by the secondary mirror should appear in the very center of the out-of-focus circle, like the hole in a donut. If the “hole” appears off-center, the telescope is out of collimation.

If you try the star test but the bright star you have selected is not accurately centered in the eyepiece, the optics will always appear out of collimation, even though they may be perfectly aligned. It is critical to keep the star centered, so over time you will need to make slight corrections to the telescope’s position in order to account for the sky’s apparent motion.

Out of collimationCollimated

Figure 16. A star test will determine if a telescope’s optics are

properly collimated. An unfocused view of a bright star through the eyepiece should appear as illustrated on right if optics are perfectly collimated. If circle is unsymmetrical, as in illustration on left, scope needs collimation.

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Orion 9968 instruction manual Appendix Collimating, Star-Testing the Telescope
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