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Aside from the obvious vignetting, the star flares look very strange. The Horsehead photo seems to indicate a flare to one side. Have you checked the collimation of this scope? I would start there. And check the focuser collimation too. Make a simple paper target the diametre of your objective and put a dot in the exact centre, Place a laser in the focuser and see where the laser dot falls in relation to your paper centre spot. Adjust your focuser alignment screws so thst the laser sits on the centre spot. Next step is to do a star test to check for objective tilt.
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