Have you ever given thought to whether you should be using open emitter optics vs closed emitter optics? While closed emitter optics close in the emitter with two sheets of glass, they do not necessarily offer better protection. Prone to fogging when you move with your weapon from the cold into the warm, they pose a potential hazard in high-stakes situations. In this video by Abner Miranda, he provides a firsthand account of a closed emitter optics failure, and the reasoning behind choosing open emitters for his weapons.