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Its probably going to need 2 hours or more to stabilise temperature wise.
I find my CDK17 takes about 2 hours to get the mirror temp within .5C of ambient.
If the temp difference is more than about .5C you will find focus is softer.
If it is 3C different it will be quite soft. So keep that in mind. With these types of scopes it is best to turn the fans on early to get the temps equalised as early as possible.
Greg.
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