Review on Unlocking Photographic Creativity: Mribo Triangular Photography Experiments Teaching by Bennie Wilks

Worked well but the corners are badly chipped after a sharp point. Needed for video so I need to buy a new one to have something better for recording. Like all prisms, it won't work with a flashlight at close range because the light from the flashlight isn't linear enough. You can fix this by moving the prism farther from the light source (about 10-20 feet). This removes most of the nonlinear light and creates a rainbow. A flashlight that can and does focus on a prism is recommended for this distance. Photos included for others to see.