Review on 📸 Crystal Photography Tutor: Spectrum Instruction for Photographers by Vince Preston

This is supposed to be a photographic prism, but instead it's a plexiglass triangle with a weird coating on it. 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.