ILFORD SFX 200 EXTENDED RED SENSITIVITY FILM . SFX 200 is a medium speed black and white camera film for creative photography. It has extended red sensitivity and is especially suited for use with a filter to create special effects. By using a deep red filter skies can be rendered almost black and most green vegetation almost white. Its unusual tonal rendition ensures interesting results for a range of subjects, including portraits, landscapes, townscapes and architecture.