A Long Wavelength Infrared(LWIR)wide-angle lens whose Field Of View(FOV)is 110°was proposed.The operating wavelength of the lens is a range from 8to 12μm,the operating temperature range is-40℃~60℃,the effective focal length is 5mm,and the Fnumber is 2.This design utilizes a combination of 6lens elements that are made of chalcogenide glass materials,Zinc Sulfide,and Zinc Selenide.The optical powers of the lens elements as well as their locations were carefully calculated and optimized to simultaneously elimi...