Optical effect diffusing image while maintaining focus — achieved via filter or lens for romantic, dreamy imagery.
Technical Details
Classic soft focus filters consist of optical glass with integrated microstructures, mesh fabric, or Vaseline-like coatings. Tiffen's Pro-Mist filters use layers of varying density (1/8, 1/4, 1/2, 1, 2), while Black Pro-Mist additionally reduces contrast. Schneider-Kreuznach Classic Soft Filters work with 1-4 strength grades. Light diffusion occurs through controlled refraction, with approximately 15-30% of the light being scattered diffusely, while the core remains sharp.
Modern variants include Hollywood Black Magic, Glimmerglass, and Digital Diffusion Filters. Lens manufacturers like Cooke (SF series) and Zeiss (Softar filters) integrated soft focus directly into the optics.
History & Development
In 1916, Karl Struss developed the first professional soft-focus filter for Pictorialist photography. From 1920 onwards, the soft focus filter became established in Hollywood productions, initially mainly for portraits of female stars. Cinematographer Lee Garmes popularized the technique in "Morocco" (1930) with Marlene Dietrich.
In the 1970s, Tiffen introduced systematic Pro-Mist series. The 1980s brought Black variants for an enhanced vintage look. Since the 2000s, digital post-production tools have supplemented physical filters but cannot fully replicate their organic characteristics.
Practical Use in Film
Cinematographer Roger Deakins used Pro-Mist filters in "Blade Runner 2049" for a futuristic atmosphere. "The Crown" (Netflix) employs Black Pro-Mist 1/4 for timeless portraits. Horror productions often use stronger grades (1-2) for surreal moods.
The filter is typically screwed onto the lens (thread sizes 77-114mm) or used in matte box systems (4x4" or 4x5.65"). With digital cameras, soft focus often mitigates the overly sharp sensor characteristics. Disadvantages include contrast loss, potential flare issues, and reduced detail resolution.
Comparison & Alternatives
Soft focus differs from blur by retaining basic sharpness – details remain recognizable, only softened. Unlike Gaussian blur in post-production, physical filters create organic, light-based diffusion with natural highlight halos.
Alternatives include nylon stockings placed in front of the lens (budget solution), digital diffusion plugins, or special soft-focus lenses. Black variants offer additional contrast reduction, while clear filters only affect sharpness.