What causes swirly bokeh?

Started Jul 16, 2014 | Questions thread
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What causes swirly bokeh?
Jul 16, 2014

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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