Buying a ball lens involves choosing between two very different products: (often called "Lensballs") and high-precision industrial optics . 1. Photography Ball Lenses (Refraction Photography)
: Never leave these in direct sunlight; they act as powerful magnifying glasses and can easily start fires. 2. Industrial & Precision Ball Lenses What is Lensball Photography and How to Get Started
: Look for "bubble-free" and "scratch-resistant" K9 glass to ensure sharp image refraction.