What causes swirly bokeh?

Started 10 months ago | Questions thread
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AM4L
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What causes swirly bokeh?
10 months ago

Serious question, anyone know?

I have seen a variety of answers googling, none seemingly difinitive on the topic.  They rang feom anything causing space between rear element and sensor to the apaerature set and speed of the blades.

anyone have the answer?

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