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Step 2: Rough Collimation:
To collimate your CDK you will need to have a low power, 1.25” eyepiece inserted into the
Ronchi Spacer.
a. Point the telescope at a bright star.
b. Defocus the star until it becomes a donut-like ring. If the donut hole appears well
centered in the donut, proceed to Step 3.
c. If the donut hole is not centered, adjust the collimating screws on the back of the
secondary mirror so that the defocused star moves in the direction of the fat side of
the donut, as shown in Figure 5. Re-center the star and repeat this process until the
donut hole looks centered as shown in Figure 6. See below for details on how to
adjust the collimating screws.
Figure 5: An example of what you would see through a low-power eyepiece for an out-of-focus, out-of-
collimation telescope. To collimate this telescope you would adjust the secondary collimating screws so that
the out-of-focus star moves in the direction of the arrow.
Adapter included with CDK12.5
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