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Simply putting a heart shaped cut-out in front of the lens

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turns this

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into this

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How does that happen? What's the optics behind this phenomenon?

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  • \$\begingroup\$ This is related to why the aperture impacts bokeh shape and is also why you have to use a wide enough aperture. The bokeh shapes comes from whatever portion of the lens limits the size of the entrance pupil (the front of the lens) visible to the sensor. \$\endgroup\$
    – AJ Henderson ♦
    May 9, 2014 at 14:22

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