Related Manuals for PlaneWave Instruments CDK12.5
Summary of Contents for PlaneWave Instruments CDK12.5
- Page 1 PlaneWave CDK Telescope Instructions Setting the spacing and collimation for the CDK12.5 July 10 , 2020...
- Page 2 The steps below cover the entire process of both collimating and correcting mirror-spacing of the CDK12.5. If your telescope is new, and/or your telescope’s mirror spacing has not been adjusted since leaving the factory, it should only be necessary to address rough and fine collimation (step 1 and step 4).
- Page 3 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. Figure 6: An example of an approximately collimated defocused star.
- Page 4 The secondary on the CDK is spring loaded, pulling the secondary into the three collimating screws For the CDK12.5 there are four collimation screws and a central bolt used for spacing which is set at the factory Step 2: Setting the Primary-to-Secondary Spacing: The primary-to-secondary spacing is set at the factory.
- Page 5 About the Ronchi Test Figure 8 illustrates the basic idea behind using a Ronchi grating to identify the position of the focal plane. The light from a single bright star passes through the optical system and converges to a point on the focal plane.
- Page 6 For example, for every 1mm the secondary spacing is changed on the CDK12.5, the focal plane moves 7.5mm. You want to keep the error at the focal plane to 5mm or better, which equals just under two lines on the Ronchi.
- Page 7 The CDK secondary mirror is not spring loaded, so you must always keep tension in the collimating screws and the central bolt. To move the secondary toward the primary mirror: 1. Loosen four screws for the CDK12.5 secondary in equal amounts to maintain your collimation.
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Page 8: Back Focus
This means that the focal plane of the telescope is a set distance behind the backplate of the telescope. The back focus of the CDK12.5 is 10.445” from the rear of the telescope or 7.19” from the flange of the supplied Hedrick focuser when fully racked inwards. - Page 9 1. The face plate of the focuser (200340) has four threaded holes that should be used to mount any of Planewave’s SecureFit adapter. Use the ¼-20 screws provided with your SecureFit adapter to mount it on the face of the focuser. 2.
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