especially when it’s possible to cast custom lenses at home using silicone molds and epoxy resins. Possible, but not exactly easy, as [Zachary Tong] relates. His journey into custom DIY optics ...

Once the inner and outer molds were built, he secured them to his base and mixed up some polyester resin. A few hours later, he pulled apart his molds and smoothed out his project box with some ...