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Nov 21, 2022 at 15:58 history edited Shub CC BY-SA 4.0
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Nov 21, 2022 at 10:43 vote accept Shub
Nov 21, 2022 at 8:43 comment added José Andrade See Mike Stone's answer. I must add that the quality of the stars created by bright lights is usually a factor in the quality of a camera objective. The nicer, sharper they are, usually the higher the grading of the objective, which was designed to take that into account. Each blade of the aperture will diffract light. The images you posted, specially the first, are taken with a quite small aperture to emphasize the diffraction spikes effect. The number of arms is equal to the number of blades if its an even number, and 2x the number of blades for uneven numbers.
Nov 20, 2022 at 16:20 answer added mike stone timeline score: 3
Nov 20, 2022 at 15:33 history edited Shub CC BY-SA 4.0
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Nov 20, 2022 at 12:04 history edited Shub CC BY-SA 4.0
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Nov 20, 2022 at 12:04 answer added akhmeteli timeline score: -1
Nov 20, 2022 at 11:33 history edited Qmechanic
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Nov 20, 2022 at 11:08 history asked Shub CC BY-SA 4.0