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CDK collimation
I'll start with a question and then give the background.
Has anyone used a Tak collimation scope to collimate a PW CDK?
I have been pottering around with my new CDK - T Point model, V Curves etc - while I wait for the moon to go away. CCD inspector tells me that my collimation could be touched up a bit. So I've been star testing and using CCDI to try and improve it.
So far I have found it a bit finicky - a small movement in the secondary screws makes a substantial change in collimation. But I believe that is normal.
Just to see how it looked, I slotted in my Tak collimation scope which I had bought to sort out the RC8. It looked quite close but could do with a touch up. So I adjusted the collimation so that the secondary spot was correctly centered. What I find interesting is that the Tak scope suggests that the primary is out a bit - not much mind. The Tak scope shows a rim around the secondary that should be symmetric. In my case, it isn't quite. This usually means that the primary needs adjustment. But the CDK has a fixed primary.
So I'm wondering - is this only relevant for other types of scopes and not the CDK? Or maybe the central spot of my second at is not quite centred. If so, I may think that I am properly collimated when I am not.
I plan on star testing it all this evening so there's no drama either way. But I was wondering if anyone else has undertaken this exercise.
Pete
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