The makers of kitschy commercial religious art of the Christian persuasion should be grateful to the telescope builders of the world for so often putting the secondary mirror struts in a cross shape.
Ooh, I wish I'd known that back when I was on Ghost Hunters boards. Some really gullible people thought they'd seen some kind of "ghost star" in a photo, where I was sure a bright star (the ghost star! ooh, scary!) had been cut 'n' pasted in. The star that was pasted in must have been photographed by another camera with a different lens, since no other star in the photo had the same kinds of spiky bits emanating from it.
Not necessarily--it could be that the bright light was just the only one in the frame that was bright enough to show visible diffraction spikes, from whatever was causing them (maybe the camera aperture).
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