The Tiffen Smoque 3 4 x 4" filter is a unique diffusion filter that imparts a hazy, smoky quality to your images, imitating the effects of a smoke or fog machine. This filter is ideal for situations where one would normally encounter smoke, but it is not available or present. Density 3 produces more smoke effect than 2, but less than 4. Tiffen filters are manufactured using ColorCore technology, a process that involves laminating the filter substrate between 2 pieces of optical glass and grinding it flat to a tolerance of 1/10,000th of an inch. This filter measures 4 x 4" / 101.6 x 101.6 mm. Features: - Produces a hazy, smoky effect across the entire image. - Imitates the operation of a smoke or fog machine. - Ideal for situations where smoke might be present, but is not. Specifications: - Type: Smoke effect/diffusion - Size: 4 x 4" / 101.6 x 101.6 mm - Grade: Density 3 - Effect: Produces a smoke-like hazy effect - Construction: ColorCore technology