Lee Filters diffusion material reducing light by 0.3 stops with subtle scattering and no color temperature shift.
Definition
251 Diffusion refers to a special diffusion material used in professional film lighting for controlled scattering and softening of light sources. This designation originates from the Lee Filters color filter catalog, where "251" is the product number for a quarter white diffusion material. The semi-transparent material minimally reduces light intensity (approximately one-quarter stop) while creating very subtle, natural-looking light diffusion.
251 Diffusion belongs to the family of white diffusion gels and is characterized by its particularly fine structure, which softens hard shadows without noticeably altering the color temperature. In contrast to stronger diffusion materials like 250 (half white diffusion) or 216 (full white diffusion), it retains more of the original light direction.
Practical Application
In film practice, 251 Diffusion is often used directly in front of light fixtures (front diffusion) or within softboxes and other light modifiers. The material is particularly popular for facial lighting as it conceals skin imperfections and creates a flattering, soft look. It is also used for product shots or background lighting when only minimal light scattering is desired.
Technical Details
The material is heat-resistant and can be used with high-power tungsten or LED lights. The light loss is approximately 0.3 stops, which must be taken into account during exposure metering.