I have included a video to this post. The original post is just below the video.
Here is what you need to make a simple beauty dish; white plastic bowl, foam board, zip-ties (zap straps), aluminum tape
Trace around the front of your flash. Make sure it is centered on the bottom of the bowl.
Fold the flaps back 90º.
(Trick – once the flaps are cut, fill your sink with hot water from the tap, let the bottom of the bowl sit in the hot water for about 5 min. to heat up the plastic making it easier to fold back)
Cut slits into the plastic bowl just big enough for the zip ties to fit through every 90º
(Trick – you might have to insert a small flathead screwdriver into the slits to stretch them just enough to get the zip-ties through, the zip-ties should be held in place by the friction from the slits)
DO NOT MAKE THE SLITS TOO BIG SO THE ZIP-TIES MOVE FREELY!