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Yes, that patch of material is an anti-reflection material (like a flocking), to keep light from reflecting off the side of the tube into the focuser tube and thus into the camera or eye piece. Mine has one as well.
Does your DSLR have a filter mod for full spectrum? You have pretty good 'curtain' capture behind the Horsehead, which is normally mostly Ha. Nice first shot. What are the details of that shot: number of subs, stacking, duration, etc? Or is it a single test sub?
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