Review on Crystal Photography Teaching for Decorative Photographers by Patrick Arnautov

It's supposed to be a photo prism but instead it's a triangle of plexiglass with some kind of weird coating. It really doesn't capture light very well. I was hoping to use this to project a rainbow onto an object, but it doesn't work very well. There's a line on the cover that breaks it up, so there's some distortion. The word purity does not apply. The packaging was decent, but it comes in what looks like a cheap sunglass case. If exposed to heat for a long time, it becomes brittle.