Model 44F14. 4x4" size for use with matte box. Retails originally for $289/each.
The Tiffen 4 x 4" Fog 1/4 Filter simulates the effects of natural fog or mist by creating a soft glow around highlights and lowering the overall contrast of the scene. There can also be a softening effect due to how the light interacts with the subject matter.
The 1/4 density provides a greater amount of fog effect than the 1/8, but less than the 1/2, and requires no exposure compensation.
Tiffen filters are made using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 4" / 101.6 x 101.6mm.