>>3628489There are two easy ways to do it. The cheap way is to use a CD. Hold it close to your lens and you will get some colors out of it. But it won't be transparent.
The "proper way" is to just buy a prism from Amazon. It's like $20. Hold it close to your lens until you get rainbows to appear. It's what I did for that pic.
This pic turned out really green and yellow cause of the subway's lighting. But I kinda like it.
