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Yes a baffle or 2 in the focuser is a way to avoid this but have you ray traced the optical path to make sure you are not intruding on the light path.
A lot of 2" focusers especially in short focal ratio newts won't have a lot of room for allowing baffles.
Do you have or use Newt 2.5 ?
It is a help in designing and determining the light path of a Newtonian.
Mark
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