DIY Lightweight Ring Flash

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This is the schema of the ring flash. The ring's dimensions are expressed with several parameters. Just choose the value in centimeters or inches or whatever for them.
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Draw on your A3 drawing sheets. Cut on the red lines.
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Start cutting.
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Long story short... the result.

I used a dark paper to cover the head of the ring.
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TESTS

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In front of a mirror.

You can see the problem due to the interal cylinder.
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DIRECT FLASH: hard shadows
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FLASH on the CEILING: diffuse light.
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RING FLASH: diffuse light.
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RING with OVEN PAPER.
I attached the paper to the external border.
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RING with OVEN PAPER.
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RING with OVEN PAPER.

NOTE: The oven paper warms up the light's temperature (better!).
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