This polyhedron is a classic prism made from professional-grade optical crystal glass. If you’ve never used a prism before, you’ll enjoy splitting the different wavelengths that make up light into red, orange, yellow, green, blue, indigo, and violet. Hold the prism in different positions in front of your lens to get hazy, ghostly, or double exposure effects, and of course, add rainbows to your subjects. This prism is six inches by one inch and comes with a microfiber cloth bag to wipe off fingerprints (which will show up in your photo). A handy PDF is included with tips to get you started, and the special scratch-resistant glass is hardy and forgiving.