V112907
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Collimation and Secondary Spacing Procedure
The CDK optical design has four optical elements shown in figure 1. The primary mirror
and the two element lens group are permanently mounted and aligned at PlaneWave
Instruments. The secondary mirror is movable to allow fine collimation and to set the
spacing between the primary and secondary. To get the best performance out of the CDK
optical system, the optics must be collimated and secondary to primary mirror spacing
must be set.
Figure 1: The optical layout of the CDK system. The system contains 4 elements which consist of the
primary mirror, the secondary mirror and a 2 element lens group.
Key Components
Figure 2. Here are the standard accessories used for collimation and setting the primary to secondary
distance for the CDK12.5 and CDK20.
Secondary Spacer
Ronchi Ocular
2” Adapter for CDK20
2” Adapter for CDK12.5
