I have been trying to take some Tumblr rainbow photos forever but it seemed impossible to get good rainbows. I even bought a prism and couldn’t get it to work. Finally, after trying anything and everything, I figured out the right way to do it with a CD.
YOU WILL NEED:
-CAMERA OR ANOTHER PHONE CAMERA
This is all about balancing. It’s not a super hard technique but might take practice. You hold the CD with your pointer finger in the middle and the back of your phone against it so your flashlight is shining right on the CD.
Then aim it at the wall or subject and move things around until it looks how you want.
If you hold the CD closer to the flashlight you get a softer rainbow.
If you hold the CD perpendicular to the phone then you get more vibrant rainbow and it has more shape.
Again it may take some practice but its really easy once you get the hang of it. Enjoy!