Barn doors are hinged metal flaps, usually four, that fit on the front of a light. You use them to control where the light goes: fold a flap in and it blocks part of the beam, keeping light off a background, a ceiling, the camera lens or a part of the subject. They do not change how soft or hard the light is. They only trim the edges of the beam.
The name comes from the way each flap swings on its hinge like a barn door. A typical set has two larger flaps on opposite sides and two smaller ones between them, all mounted on a ring that clips or slides onto the front of the light. On most sets the ring rotates, so you can turn the whole assembly and cut the beam at an angle instead of only straight up, down or sideways.
What Barn Doors Are Used For in Lighting
Barn doors solve one problem: light going where you do not want it. The common jobs are:
- Keeping light off the background. Close the flap on the background side and the subject stays lit while the backdrop falls darker. This is how you separate a subject from a background without moving the light.
- Stopping lens flare. A rim light or hair light placed behind the subject often points partly toward the camera. One flap closed on the camera side stops the light from hitting the lens, which removes flare and the washed-out haze it causes.
- Restricting a hair light or accent light. A light meant only for the hair or shoulders tends to spill onto the face, the floor and the background. Barn doors narrow it to the strip you want.
- Controlling spill on walls and ceilings. In a small room or on location, light bouncing off a nearby wall or low ceiling acts as unwanted fill and lowers contrast. Trimming the beam keeps the room from lighting itself.
- Shaping a slash or strip of light. Close two opposite flaps until only a narrow band gets through and you can lay a stripe of light across a background or a product.
- Keeping light off part of the subject. In product and food work, you can keep a hot reflection off a shiny label or hold the front edge of a plate slightly darker so the eye goes to the center.
In each case the light keeps its character. A hard source stays hard and a soft source stays soft. If you want to change the quality of the light itself, that is the job of a modifier such as a softbox, umbrella or beauty dish. Hard vs soft light explains that difference.
Which Lights Take Barn Doors
Barn doors work best on lights with a fairly small, directional source, because they cut the beam close to where it leaves the light:
- Fresnel and open-face fixtures used in film and video, which nearly always have a barn door ring.
- Continuous LED lights, both small panels and the single-source lights that take a reflector.
- Studio strobes fitted with a standard metal reflector, which can take a barn door set that clips onto the reflector.
- Small flashes, for which light, folding barn door sets exist.
They do little on a large softbox or umbrella. The source is so wide that a small flap at one edge barely changes the beam. For a large soft source, use a grid on the front of the softbox or a separate flag.
How Sharp Is the Edge of a Barn Door Cut?
Less sharp than many people expect. Because the flaps sit right at the light, the shadow they cast has a gradual edge: light falls away over a band rather than stopping on a crisp line. How wide that band is depends on three things:
- Size of the source. A small, bare source gives a cleaner cut than a large one.
- How far the flap reaches past the source. A flap opened out flat in front of the light cuts more cleanly than one folded back close to the bulb.
- Distance to the subject. The farther the light is from the subject, the wider the soft band becomes on the subject.
When you need a truly crisp line, use a flag: a separate black panel held on a C-stand between the light and the subject. The farther the flag is from the light and the closer it is to the subject, the harder the edge of its shadow. Barn doors are the quick, always-attached version of a flag; a real flag gives more control.
Barn Doors vs Grids, Snoots, Flags and Gobos
Several tools limit where light goes. They differ in how they shape the beam:
- Barn doors: What it does to the beam: Trims one or more edges; the beam can be any shape between open and a narrow strip. Best for: Keeping light off a background, ceiling or lens; making a slash of light.
- Grid: What it does to the beam: Narrows the beam angle evenly all around, so light falls off gradually at the edges. Best for: A controlled pool of light, softboxes with less spill.
- Snoot: What it does to the beam: Squeezes the beam into a small circle. Best for: A spot of light on a face, an object or a background.
- Flag: What it does to the beam: Blocks light from a distance, with an edge as hard or soft as you place it. Best for: Precise cuts, large sources, keeping light off one area.
- Gobo: What it does to the beam: Projects a pattern or shape of shadow. Best for: Window patterns, leaf shadows, textured backgrounds.
Barn doors and grids are often used together. The grid narrows the beam, and the flaps trim its edges into the shape you want.
How to Use Barn Doors, Step by Step
- Place and aim the light first, with every flap open. Get the light where it looks right on the subject before you start cutting.
- Turn on a modeling light or use the continuous output so you can see the beam.
- Close one flap at a time, watching where the light falls on the subject and the background. Stop as soon as the unwanted light is gone.
- Rotate the ring if the cut needs to run at an angle, for example along a diagonal wall.
- Check from the camera position. Look toward the light from beside the lens. If you can see the bright face of the light, it can flare; close the flap on the camera side until the lens sits in shadow.
- Take a test frame and look at the edges of the lit area and at the background brightness before you shoot.
Common Mistakes With Barn Doors
- Closing all four flaps. Squeezing the beam into a small square creates a spotlight look you may not want. One or two flaps usually do the job.
- Expecting softer light. Barn doors trim the beam; they do not soften it. Add diffusion or a softbox for that.
- Expecting a razor edge. The cut fades over a band. If the line has to be crisp, use a flag placed away from the light.
- Grabbing hot flaps. On tungsten and other hot lights the flaps get hot enough to burn within minutes. Wear heat-resistant gloves. LED lights run much cooler but still warm up with long use.
- Loose hinges. Flaps that will not hold position slowly drift open during a shoot. Check the cut again between setups.
Barn Door Questions
What are barn doors used for in lighting?
They control where light falls. Photographers and filmmakers use them to keep light off backgrounds, walls and ceilings, to stop a backlight from flaring into the lens, and to narrow a hair light or accent light to one area.
Do barn doors soften light?
No. They block part of the beam, so the light that gets through has the same quality as before. To soften light you need a larger source, such as a softbox, an umbrella or a diffusion panel.
What is the difference between barn doors and a snoot?
A snoot squeezes light into a small round spot. Barn doors trim the beam on chosen sides, so you can block light in one direction only, or shape it into a strip.
Can you use barn doors on a flash?
Yes. Studio strobes take barn door sets that fit on their reflectors, and small folding sets exist for portable flashes. They work the same way as on a continuous light, but you need the modeling light, or a test shot, to see the cut.
Want to see where every light and flag goes in a real setup? Three-point lighting covers the key, fill and back light and how each one is controlled.
Looking for the wider set of tools that shape light? Light modifiers covers softboxes, umbrellas, grids, snoots and reflectors and when to use each.