Last Updated 19 minutes ago
Filmmaking Dictionary: Number 4 / 4′ × 4′ Frame
Definition
A 4′ × 4′ frame is a grip frame approximately four feet wide and four feet high. It supports a lighting-control material such as diffusion, a net, a solid or a bounce surface, depending on the frame and fabric system.
The size is about 1.22 metres square. ‘Four-by-four’ describes dimensions, not the material’s light loss, diffusion strength or safe mounting capacity.
What the Material Does
- Diffusion: Spreads transmitted light and can create a larger apparent source when illuminated appropriately.
- Net: Reduces light with relatively little change to its direction or hardness.
- Solid: Blocks light and can provide negative fill.
- Bounce: Reflects light, with the surface affecting spread and character.
A bare frame and a finished flag or diffusion frame are not necessarily the same rental item. Specify both the size and the required material when ordering.
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Lighting Example
A hard source is aimed through a four-by-four diffusion frame near an actor. If the light fills the material, the illuminated frame can become a larger apparent source from the actor’s position. If only a small central patch is lit, the useful source size is smaller than the frame’s outside dimensions.
Moving the frame closer to the subject generally increases its apparent size, but it also changes coverage, falloff and the space available for blocking. Check the entire movement rather than only a stationary mark.
Support and Handling
Use the frame’s intended mounting points and a support arrangement appropriate to the setup. The key grip and grip team should assess the material, height, orientation and exposure to wind. A lightweight frame can still present a substantial surface to moving air.
Keep the working area clear and check that the frame does not interfere with camera movement, performers or exits. A stable-looking setup indoors should not be assumed suitable outside without reassessment.
Common Mistakes
- Confusing four feet with a 4″ × 4″ camera filter.
- Calling for a ‘four-by-four’ without naming the material.
- Assuming all fabrics on the same frame have the same transmission.
- Lighting only a small portion of a diffusion surface while expecting the effect of its full size.
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Frequently Asked Questions
Is a four-by-four always diffusion?
No. The frame can support several kinds of light-control material.
Does its size tell me how much light it removes?
No. Transmission depends on the material and setup.
Related Terms
- Diffusion
- Fractional Diffusion, Gel and Filter Strengths
- 1x Net / Single Scrim
- 6′ × 6′ Frame
- 4″ × 4″ Camera Filter
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