Definition
What is shutter angle in video?
Shutter angle expresses exposure duration as a portion of each frame interval, using the geometry of a rotating shutter as a reference. At any frame rate, 180 degrees exposes for half of the frame interval.
At 24 fps, a 180-degree shutter is about 1/48 second; at 60 fps, it is about 1/120 second. That relationship makes shutter angle convenient when changing frame rate, because a 180-degree setting preserves the same proportion of motion blur without calculating a new speed.
Smaller angles mean shorter exposures and crisper, more staccato motion. Larger angles mean longer exposures, more blur, and more light, within the camera’s physical or electronic limits. The setting is conceptually based on film cameras but is common on digital cinema cameras too.
Example in the edit
A scene switches from 24 fps to 48 fps for slow motion. Keeping a 180-degree shutter automatically changes the exposure time from roughly 1/48 to 1/96 second.
Why editors use it
Shutter angle gives crews a consistent motion-blur convention across frame rates and makes exposure settings easier to communicate on cinema cameras.
Quick answers
Frequently asked questions about Shutter angle
What is a 180-degree shutter?
It exposes for half of each frame period, producing the conventional amount of motion blur for the selected frame rate.
Does shutter angle change frame rate?
No. It changes exposure duration within each frame interval; frame rate remains a separate setting.
Why use shutter angle instead of shutter speed?
Angle automatically maintains the same exposure fraction when frame rate changes, which is useful when preserving motion rendering matters.