Some very good theory ideas, anything will help.
I have some smaller 1.25" filters that i might try out.
Just means removing the OAG from the imaging train and using a regular guide scope if i want to do long exposures.
Worth a try with the smaller filters just to see if the effect is still there.
That way it will at least start eliminating a few things i am thinking.
I have found that to test all i have to do is take am image of one of the brighter stars, so that makes things just a bit quicker also.
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