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Figure 7: The CDK12.5 collimation screws and the central secondary spacing bolt. The CDK17
mechanism is identical to the CDK12.5.
Figure 8: The CDK24 collimation screws and the central spacing knob. Collimation adjustments use the
three outer knobs.
Step 2, Setting the Primary-to-Secondary Spacing:
The primary-to-secondary spacing is set at the factory. You will typically not need to
adjust this unless the secondary has been moved.
For your CDK optical system to perform as well as it should, the spacing between the
primary mirror and secondary mirror should be set to an accuracy of +/- 1mm!
Fortunately, you won’t have to directly measure this spacing. When the primary-to-
secondary spacing is set correctly, the focal plane will land at an exact known distance
Collimation knobs
Central Secondary Spacing Bolt
Collimation knobs
Spacing knob
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