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How did you take the photo? Afocally with the newt and a camera pointing into the eyepiece?
If so, you're right - the black hole is actually the secondary. It can be a problem with afocal newt photography. Try various combinations of eyepieces and lenses (depending on teh camera). Even the positioning of the camera when pointing in the eyepiece can sometimes reduce/eliminate it.
Nice job.
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