Medium sensitivity ISO 200 Extended red sensitivity Improved results with SFX filters SFX 200 is a medium-sensitivity black and white camera film for creative photography. It has an extended red sensitivity and is particularly suitable for use with a filter to create special effects. By using a deep red filter, the sky 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, cityscapes and architecture.