[#ELEGOOSaturn2] [Fresnel Collimating Light Source] Under the LCD screen, #ELEGOOSaturn2 8K boasts the industry's first combination optical design of COB (Chip On Board) and Fresnel Collimating Light Source(FCLS), a patented technology that was independently invented by ELEGOO R&D team. A Fresnel lens, also known as the threaded lens, is made of optical grade PMMA material, has a high light transmission and can distribute the UV light very evenly. It is simple, with easy maintenance.✅ Compared t