Steps to Make the Ring Flash
Step 1: First, trace the bottom of the smaller plastic container onto the bottom of the larger plastic container. Make sure it's properly centered! Then, cut it out. The smaller plastic container should be able to fit snugly into this space.
Step 2: Cut out the bottom of the cup so that the lens of your camera can fit inside it. Again, be careful that it's centered!
Step 3: Now, in the side of the bowl, carefully mark out an outline of the top of your flash centered between the top and bottom edges, then cut it out. Again, the flash should be a snug fit.
Step 4: Now, line the inside of the bowl and the outside of the cup with aluminum foil, gluing and taping where appropriate. If you're using an expanding glue, make sure to flatten the foil from time to time.
Step 5: So that you don't damage your camera with sharp plastic and metal edges, line every edge with tape.
Step 6: Now, place the cup within the hole in the bowl, centered and straight, and glue it in securely.