Hi everyone. In my quest to be frugal and saving every penny for lenses, I created a macro flash ring using only the camera's built in flash. This setup takes a while to make, but the results are excellent. The casing is made out of cardboard. Simply line the insides with smooth aluminum foil and tape the duct to the pop up flash and you're set! Please note I have not put on a diffuser yet. C&C welcome!
Edit: I added some test pics. My skills and lenses aren't up to par yet, so no bug pics for the moment . There's 2 shots of a penny, 1 shot of a gift card's text, and 1 shot of a part of a person's iris (no humans were harmed during shooting ).
Schematics are on the 2nd page of this thread.