Just a few hours ago we saw another DIY approach to building an integrating sphere, this time using a small cannonball mold of all things. Before that we hadn’t actually seen too many light ...

The interior of the integrating sphere is composed of Zenith diffuse polymer material, a solid, machined form of PTFE. Zenith ® is a highly reflective (>95%) and Lambertian reflector over the wide ...

There are two ports in the sphere, one for admitting light — usually ... expensive commercial integrating sphere, or turn one on a lathe, [Les] turned to an unlikely source: cannonball molds.