Tiffen Pro-Mist filter: diffusion filter that scatters highlights and flatters skin tones without sacrificing sharpness.
Technical Details
Pro-Mist filters consist of a clear optical disc with a microscopic lacquer layer into which micropores of 2-8 micrometers in diameter are etched. Tiffen produces five grades: 1/8, 1/4, 1/2, 1, 2, and 5, with the numbers indicating the intensity of diffusion. The filters cause no measurable light loss and alter the color temperature by less than 50 Kelvin. Schneider-Kreuznach offers a similar product line with six grades in their Classic Soft series.
History & Development
Tiffen developed the Pro-Mist filters in 1978 in response to the growing demand for more subtle skin softening in portrait photography and cinematography. The first feature film to systematically employ Pro-Mist was "Kramer vs. Kramer" (1979), shot by Néstor Almendros. In the 1980s, the filters became standard for glamour shots and romantic scenes. Digital cinematography from 2005 onwards led to a renaissance of Pro-Mist filters, as digital sensors often produce images that are too "clinically sharp."
Practical Use in Film
Roger Deakins used Pro-Mist 1/4 for the interiors in "Blade Runner 2049" (2017) to make the LED practicals more atmospheric. Emmanuel Lubezki combined Pro-Mist 1/2 with candlelight in "Barry Lyndon"-inspired scenes of "The Revenant" (2015). The filters are particularly effective in backlight and night shots – daylight exterior scenes usually only require 1/8 or 1/4 strength. Pro-Mist filters cannot be replicated digitally, as the halation around light sources is created optically and interacts with the depth of field.
Comparison & Alternatives
Unlike glimmer glass filters, Pro-Mist filters do not create starburst effects, but only diffuse halation. Black Pro-Mist filters (since 1999) combine diffusion with slight contrast reduction through carbon particles and are suitable for a modern, less romantic look. Digital diffusion plugins like DaVinci Resolve's "Film Halation" or ACES Glow do not achieve the natural interaction between light source, diffusion, and optics. Petroleum jelly on UV filters was a guerrilla alternative but leaves streaks and damages equipment.