abstract:A film holder is a device that holds one or more pieces of photographic film, for insertion into a camera or optical scanning device such as a dedicated film scanner or a flatbed scanner with film scanning capabilities. The widest use of the term refers to a device that holds sheet film for use in large format cameras, but it can also refer to various interchangeable devices in medium format camera systems.
Flatplanetaryholder is used in big areaopticalfilm for outdoorlighting and film thickness uniformity is counted in this paper. The resultofuniformity is gained after testing.