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DSLR built-in flash directional diffuser

Step 3Line the inside of the cup with aluminum foil

Line the inside of the cup with aluminum foil
Line the inside of the cup with the aluminum foil. It might be tricky to only use a single piece since the opening is larger at one end. I also kept the non-shiny side facing the inside of the cup to increase the light diffusion. It's not a big deal if the foil gets crumpled either.

Use small peices of double-sided tape to held the foil in place.
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Author:utter-imadness