Definition
What is the exposure triangle in video?
The exposure triangle is a teaching model for the linked choices of aperture, shutter speed, and ISO. Each affects recorded brightness, while each also changes a different visual property of the image.
Aperture affects depth of field, shutter speed affects motion blur, and ISO affects camera sensitivity behavior and noise. If one setting changes, another setting, the light level, or an ND filter may need to compensate to maintain the same exposure.
For video, the triangle is not a rule that all three controls should move freely during a shot. A chosen shutter is often held for continuity, a chosen aperture may serve the desired focus separation, and ISO may be selected for the camera’s best performance. Lighting and ND then become essential fourth practical tools.
Example in the edit
To keep a daylight portrait at f/2.8 and a 180-degree shutter, the crew places an ND filter in front of the lens rather than increasing shutter speed and changing the motion blur.
Why editors use it
The model makes trade-offs visible: a brighter image is never merely brighter when the change also alters blur, focus, noise, or highlight latitude.
Quick answers
Frequently asked questions about Exposure triangle
What are the three parts of the exposure triangle?
Aperture, shutter speed or exposure time, and ISO.
Why is ND not part of the triangle?
The triangle describes camera controls, while an ND filter reduces light entering the lens without directly changing depth of field, shutter motion, or ISO behavior.
Is the triangle useful for log video?
Yes. The same exposure choices apply, though log profiles require camera-specific monitoring and exposure guidance to protect important tonal detail.