Home News Knight Optical provides Calomel Infrared (IR) Polarisers. News Knight Optical provides Calomel Infrared (IR) Polarisers. By Allrobotstalk - 13.02.2023 388 0 Facebook Twitter Google+ Pinterest WhatsApp Knight Optical, the most distinguished vendor of inspected and measured optics, is thrilled to unveil its new selection of high-grade components, Calomel Infrared (IR) Polarizers.