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Umm - the light form the EP is parallel - that's what EP's do. This is definitely the central obstruction - you have to remember that the EP is maximised for viewing by eye, not magnified through a camera. Try moving your eye about 4 inches above the EP and you will begin to see the secondary obstruction interfering with your view. The camera simply magnifies this effect. If it wasn't there... how could you collimate???
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