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Old 27-12-2018, 09:23 AM
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John K
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John K is offline
Join Date: Sep 2005
Location: Melbourne
Posts: 1,403
Hi Peter,

Thanks for sharing this! As you you see from a separate thread having progressed on from a Newtonian, I am going through a learning curve with collimating CDK type scopes myself.

At the moment, using a Newtonian laser, my secondary appears centered, but the field is not, and I am getting very slight elongated stars as per your website blog.

In addition to what you have described, just a question - would simply using the secondary to find the centre of the field first and then the primary to remove any elongations also work as a technique as well?
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