His main aims were to produce a large format camera of high precision and simple operation, with a system of parts that were readily interchangeable. the large Kodak 3 and similar, and the popular Graphlex Graphic Graphlok series) and the limitations of technical (e.g., Linhof Technika) and field cameras of the day he developed a modular camera and received in 1947 a patent for his Sinar camera. Dissatisfied with the limited or imprecise nature of wooden view cameras (e.g. In 1947, the grandson of Koch senior-Carl Hans-a graduate photographer and photographic salesman, took over the family business on the early death of his father Hans-Carl, and founded the following year the Sinar company.
His son Hans-Carl, expanded the family-owned photography studios to include from 1911 photographic retailing. From 1894 until his death in 1897, Koch was also president of the Swiss Photographers Association. Koch worked as a portrait, landscape and alpine photographer and was considered one of the first Swiss champions of alpine photography. In 18 Koch also established two family-owned photography studios in Schaffhausen. The business recalls its roots to Swiss photographer Carl August Koch who worked in Marseille from 1865 to 1878.
