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Does a Newt focuser intruding into the light path create artifacts?
I'm looking at replacing the focuser on my Dob and I notice that the current one seems to intrude into the light path by about an inch when fully racked in - and the focuser only has a total travel of about 2"!
Given the fact that even terribly thin spider vanes cause diffraction spikes, I imagine that this must have *some effect?
Can anyone confirm?
Many Thanks
Markus
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