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I have CCDAP do a focus run every 30 minutes, that means at the end of each sub generally, I do a preliminary cool down of the scopes once civil ends and that gives me about an hour of cooling before the first focus run. It does not need to be focus after about 3 hours but the software only allows for focusing on a regular basis or at the change of a filter. Keeping the scope cooler might help you with focus shift, but in the end it has got to stop moving enough to get some subs in. I thought you had a carbon tube on the 12"Stuart? I don't understand why you are getting shifts like that?
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