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CJ Chris what laser collimator are you using?
Your Orion XT10i at f4.7 really needs a barlowed laser for decent primary mirror collimation.
Likewise Renato with your f4.5 dob.
Your aperture stop is just reducing your f-stop down to f10 or so where collimation becomes less critical.
If you are not seeing concentric rings at f4.5 the scope is just not collimated correctly.
gb.
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