Things You'll Need
Instructions
Remove the lid from the shoebox. If the lid folds over to close, cut it away from the edges of the box with scissors.
Cut white construction paper to fit over each side panel and the bottom of the shoebox. Glue the pieces of paper onto each panel and allow it to dry for an hour.
Make a hole in the bottom center of the shoebox that is slightly smaller than the head of your external flash unit using a utility knife.
Stretch a sheet of white tissue paper over the open top of the shoebox and secure it with tape. For greater light diffusion, and thus softer light, attach three to four sheets of tissue paper to the top of the box.
Stick the head of your external flash unit through the hole you cut in Step 3. Because the hole is slightly smaller than the flash head, the soft box will stay mounted as you take photographs.