Koachrome is the trademarked name of a brand of color reversal film sold by Eastman Kodak. Since its introduction in 1935 it has been produced in various transparency (slide) and movie formats (8mm,16mm & 35mm), and was for many years the standard film for professional color photography, especially when submitting images to major magazines such as National Geographic. Since early 2007 it has been produced only in 35mm (135) slide film format, in one speed, ISO 64.