Samyang Optics Co., Ltd. is a lens maker in Masan (Korea), established in 1972. It made several lenses for other companies' brands. Its 500mm manual focus mirror lenses were widespread, sold under several brands and badged "Made in Korea". All Sears lenses "Made in Korea" were made by Samyang. German distributor Foto Walser's "Walimex, made in Korea" lenses are also Samyang products.

Among its lenses were many for MF and AF lens mounts of Nikon, Canon, Minolta and Yashica.

Nowadays it offers manual focus tele lenses, mirror lenses and tele zoom lenses for the T-mount, as well as its SCV series of lenses for survey cameras. In 2004 it was merged with the Japanese CCTV optical devices maker Seikou.

On September 18, 2009, Samyang announced a 14mm F/2.8 IF ED MC Aspherical lens in mounts for Canon, Nikon, Sony, and Pentax. The lens will be compatible with both full-frame and 1.6x crop sensors.[1] Another ultra-wide-angle lens is the Samyang 8mm 1:3.5 Fish-Eye SI.