Bounce Board

Bounce Board

noun | Camera & Optics

A flat, reflective panel used to redirect light from a primary source - the sun, an HMI, a window - onto a subject from a different angle. Bouncing light off a large white or silver surface increases the effective size of the light source, producing soft, diffuse illumination. The bounce board is one of the simplest, most portable, and most effective light-shaping tools in cinematography, useful on both a zero-budget documentary and a major studio production.

Quick Reference

The Explanation: How & Why

The fundamental principle behind the bounce board is that the effective size of a light source - not its wattage - determines the softness of the light it produces. A small, direct light source creates hard, sharp-edged shadows. A small source bounced off a large white surface becomes, effectively, a large source. A large source produces soft, gradual shadows.

When a hard directional source such as the sun or an undiffused HMI is bounced off a 4x4-foot white foam board, the board becomes a 16-square-foot soft source. The shadows produced by this bounced light have soft, gradual transitions rather than the sharp edges of the original source. The subject is lit with a quality close to that of a large softbox or overcast sky, using nothing more than an inexpensive reflective panel.

Bounce boards come in several surface types, each producing different light qualities. White foam board (polystyrene, poly board) is the most common and versatile bounce surface, producing soft, neutral-colored, diffuse light. A 4x8-foot sheet costs approximately $11 at a hardware store. Silver reflectors bounce more light than white foam and produce a brighter, slightly harder quality. Gold reflectors add warm color to the bounced light, simulating warm afternoon sun fill. Grifflon - silver-and-white reversible fabric - provides a collapsible grip reflector with silver on one side for hard, bright bounce and white on the other for soft, neutral bounce.

The position of the bounce board relative to both the source and the subject determines the intensity and angle of the bounced light. Moving the board closer to the source increases the intensity of the bounce. Moving it closer to the subject increases the effective source size and softens the light further. Bouncing a light always reduces its intensity by approximately 1 to 2 stops compared to pointing the same light directly at the subject, because the reflective surface absorbs some light and scatters the rest in multiple directions.

Modern bounce products have expanded beyond traditional foam board. The DoPchoice SnapBridge system pairs Lightbridge CRLS precision reflectors with soft bounce materials in a portable frame. Bluff Bounce fabrics, created by Danish cinematographer Nicholas Bluff, reflect light more naturally than traditional white, silver, or gold surfaces and bring more hues to skin tones - a response to the sensitivity of modern digital sensors compared to film stock.

Historical Context & Origin

Reflective boards have been used to redirect natural light onto subjects since the earliest days of photography. Victorian portrait photographers used white-painted walls and ceiling panels to redirect window light onto subjects in dark studio spaces. Cinema adopted similar techniques as soon as filming moved outdoors and natural light needed to be shaped. White bedsheets, muslin, and later purpose-made aluminum reflector boards became standard grip equipment in Hollywood productions of the 1920s and 1930s. The development of collapsible, foldable reflectors in the 1970s and 1980s - the Lastolite and Photoflex reflector systems - made portable bounce boards a standard part of the solo cinematographer's kit. The contemporary foam board, available in large sheets from builders' merchants for around $11, made bounce lighting accessible at any budget level. For a detailed practitioner perspective on bounce techniques, see Shane Hurlbut's bounce light series at the Filmmakers Academy, which covers 32 types of bounce light sources.

How It's Used in Practice

Scenario 1 - Exterior Day (Grip / DP): An interview is set up outdoors on a bright day. The subject is positioned with the sun behind them as a natural backlight. The face is in shadow and approximately 2 stops underexposed. The grip holds a 4x4 white foam board to the side and slightly above the subject, angled to catch the direct sun and redirect it onto the subject's face. The bounced fill opens the face by 2 stops without adding any artificial light. The subject now has a warm backlight and a soft, natural-looking fill from the bounce.

Scenario 2 - Interior Low Budget (DP): Shooting a dialogue scene in a small apartment with a single window as the key source, the DP has no fill light instruments available. A grip holds a 2x4 foam board on the shadow side of each subject, angling it to catch light spilling from the window and redirect it as fill. The bounce provides a soft, window-colored fill at a 3:1 ratio relative to the direct window key. The scene is lit to a professional standard with no electrical instruments.

Scenario 3 - Controlled Studio (Gaffer): On a studio stage, the gaffer uses a 4x8 poly board as a bounce surface for a 2K HMI. The HMI points directly at the board from 8 feet away. The board redirects the light toward the subject. The resulting bounced source is approximately 4 feet wide and 8 feet tall - a very large, extremely soft key source. The gaffer adjusts the board's angle to control the key direction and raises or lowers the board's position to adjust the key height.

Usage Examples in Sentences

"Hold the bounce just outside frame to camera right - angle it until the shadow side opens up."

"A 4x4 poly board in full sun gives you as much output as a 1.2K HMI and it costs eleven dollars at Home Depot."

"The whole exterior was lit with just a bounce board redirecting the afternoon sun - no instruments on that location."

"Silver side for more output; white side for softer quality. Flip it depending on what the shot needs."

Common Confusions & Misuse

Bounce Board vs. Flag: A bounce board reflects light toward the subject. A flag is a black, non-reflective panel used to block light from reaching certain areas or the camera lens. Both are flat panels on similar rigging hardware and may be confused when listed in a lighting plan. The functional difference: bounce adds light; flag subtracts it. Both are managed by the grip department.

Bounce Board vs. Diffusion Frame: A diffusion frame is placed between a light source and the subject, with diffusion material stretched across it, to soften the light as it passes through. A bounce board redirects the light by reflection rather than transmission. Both soften light by increasing the effective source size, but through opposite mechanisms. Diffusion frames reduce light output by blocking a portion of the direct beam. Bounce boards can increase the effective light reaching the subject by redirecting what would otherwise not illuminate it, while also softening it.

Bounce Board vs. Bounce (the technique): "Bounce board" refers to the physical reflective panel. "Bounce" refers to the lighting technique of redirecting light off any surface - a wall, ceiling, or board. A bounce board is one tool used to execute a bounce. The terms are related but not interchangeable: you can bounce light without a bounce board (off a wall), and a bounce board can be used for purposes other than bouncing (as a makeshift flag or background).

Variations by Context

Key People & Films

Gordon Willis used large bounce sources to create the soft, controlled fill in The Godfather (1972), balancing the film's famously low-key chiaroscuro with subtle reflected light. Conrad Hall relied on bounce techniques for the rain-soaked night scenes in Road to Perdition (2002), using reflective surfaces to redirect practical light onto actors' faces without adding visible instruments. Cinematographer Shane Hurlbut has become one of the most vocal advocates of bounce lighting in contemporary production, documenting over 32 bounce source types in his Filmmakers Academy series. Danish cinematographer Nicholas Bluff developed the Bluff Bounce fabric system after moving to Brazil in 2019, creating reflectors optimized for modern digital sensors rather than film stock.

Equipment / Tools Reference

Matthews Studio Equipment manufactures the industry-standard 4x4 and 4x8 reflector panels and holders used to rig bounce boards on C-stands. [Westcott Scrim Jim Cine](https://www.bhphotovideo.com/c/search?Ntt=westcott+scrim+jim+cine&BI=24167&KBID=29577) offers modular bounce fabrics in silver/white reversible configurations from 4x4 to 8x8 feet. DoPchoice SnapBridge pairs Lightbridge CRLS precision reflectors with soft bounce materials in 3-foot and 5-foot collapsible frames. Foam board (polystyrene insulation panels) from hardware stores like Home Depot or Lowe's remains the cheapest and most widely used bounce surface, typically $11 for a 4x8-foot sheet. Lastolite and Photoflex produce collapsible circular reflectors in 24-inch, 36-inch, and 48-inch diameters.

Standards & Specifications

No formal SMPTE or ISO standard governs bounce board specifications, as they are grip accessories rather than capture or delivery format components. However, bounce board dimensions follow de facto industry standards: 4x4 feet and 4x8 feet are the standard sizes for rigid panels, matching the dimensions of standard grip frames and diffusion systems. Reflector fabric color temperature is expected to be neutral (approximately 5500K for white and silver surfaces). Gold reflectors shift color temperature approximately 300-500K warmer. The IATSE Local 728 (Studio Mechanics) training curriculum covers bounce board rigging and safety as part of grip department certification.

Common Questions / FAQ

Q: How much light do you lose when using a bounce board?

A: Bouncing a light off a white surface typically costs 1 to 2 stops of intensity compared to pointing the same light directly at the subject. The reflective surface absorbs some light and scatters the rest in multiple directions. Silver reflectors lose less light than white surfaces. Factor this loss into your exposure plan before committing to a bounce setup.

Q: Can a bounce board replace a softbox?

A: In many situations, yes. A 4x8 white foam board bouncing a 1K fixture produces a 32-square-foot soft source - larger than most softboxes available. The quality is comparable to a large softbox, and the setup cost is a fraction of the price. The tradeoff is less control over spill, since the bounced light spreads in all directions from the reflective surface.

Q: What size bounce board should I use?

A: Match the board size to the subject and the desired softness. For a single-person close-up, a 2x4 or 4x4 board is sufficient. For a two-shot or wide interview, a 4x8 board produces a larger, softer source. For full-body shots, 8x8 or larger frames with bounce fabric are standard. Closer placement to the subject increases softness; larger boards allow you to stay further away while maintaining softness.

Related Terms

• Bounce - The lighting technique of redirecting light off any reflective surface; the bounce board is one tool for executing this technique
• Diffusion - An alternative softening method that passes light through a translucent material rather than reflecting it
• Key Light - Bounce boards are often used as large soft key sources by redirecting a harder primary source
• Available Light - Bounce boards are the primary tool for shaping available light without adding instruments
• Gaffer / Grip - Both departments use bounce boards; gaffers direct the lighting intent, grips position the boards
• C-Stand - The standard rigging hardware used to hold bounce boards in position on set

See Also / Tools

Use the Lighting Power Calculator when a bounce board setup is supplemented by artificial sources - calculating total power draw ensures circuits are not overloaded when instruments are added alongside bounce-based setups. For the theory behind how light source size affects shadow quality, see the bounce lighting entry in the glossary.

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