Silver Oxide, have introduced a new filter which emulates the look of Orthographic film.
Until 1925, Hollywood studios used orthochromatic Eastman Standard Negative stock. Orthochromatic film was only sensitive to the brightest natural light, so large ultraviolet lamps had to be used during shooting. It also registered only blue light, so anything colored red showed up on the film as black.
Silver Oxide produce excellent digital filters which do an excellent job of emulating classic Black and White films. The new generation of SilverOxide filters also work as Smart Filters in CS3. For more info and demos visit SilverOxide.