Sun or otherwise known as Sun Kōki K.K. was a Japanese-based company that specialized in cameras for film and photography that started roughly right after WWII. The company changed its name several times to appeal to more global markets, these names would include Sun Optical Co., Ltd and Gotō Sun. The company seemingly vanished in the 1980s but there were rumors that it was bought out by Goyo Opitcal Inc. Sell your Sun equipment on Gear Focus to get the best value for your items.