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Rosco E-Colour+ #251 "Quarter White Diffusion"—a light polyester diffusion filter for subtle softening of light output.
Overview
Rosco 251 refers to the filter gel E-Colour+ #251 "Quarter White Diffusion" manufactured by Rosco. It is not a lighting fixture, a grip device, or a lamp code, but a diffusion gel (scrim) from the E-Colour+ series, which is stretched in front of a light source or inserted into a filter frame to soften the light.
Rosco's "White Diffusion" family includes several gradations, staggered by diffusion strength. #251 ("Quarter") is one of the weaker grades, producing a slight softening of the light. It is positioned below the stronger grades #216 (Full) and #250 (Half), while there are even weaker grades with #252 ("Eighth") and #452 (1/16). Compared to stronger diffusions, #251 retains more directional character, meaning shadows remain comparatively pronounced.
Technical Data
| Property | Value |
|---|---|
| Manufacturer | Rosco |
| Product Line | E-Colour+ |
| Number / Name | #251 – Quarter White Diffusion |
| Type | Diffusion / Scrim |
| Transmission (Y) | approx. 80 % |
| Light Loss | approx. 1/3 stop |
| Base Material | Polyester |
Since Rosco E-Colour+ and the LEE Filters range use the same European numbering system, Rosco #251 corresponds to the filter LEE #251.
On-Set Usage
#251 is used when the light only needs to be subtly diffused – for example, to slightly smooth the edges of a light source without significantly reducing the light output or shadow definition. Due to the low light loss of around one-third of a stop, it is well-suited when the brightness needs to be largely maintained.
- Slight softening of hard light (Fresnel lenses, PARs, open-face halogen/HMI sources).
- One of the weaker grades within the staggered White Diffusion series; below #216 (Full) and #250 (Half), above #252 (Eighth) and #452 (1/16).
- Available as sheets and rolls.
Note: Diffusion gels are heat-sensitive; depending on the base material and the lamp's wattage, ensure sufficient distance from the light source.
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Diese professionelle Lösung erhöht die Produktionseffizienz und reduziert Post-Production-Anforderungen. Sie ermöglicht flexible, schnelle Anpassungen während des Drehs.
Gaffer
Als Gaffer ist dies ein unverzichtbares Werkzeug meines täglichen Handwerkszeugs. Es ermöglicht mir professionelle Lichtkontrolle und schnelle Anpassungen auf Set, was Zeit spart und Qualität sichert.
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1. Zu welchem Department gehört „Rosco 251 (Quarter White Diffusion)"?
2. Wie viele verschiedene Fachperspektiven bietet dieser Eintrag?