open time = (shutter angle ÷ 360) × (1 ÷ frame rate). Nuke shutter = 0.5 is a 180° shutter.
Frame rate
24 fps
Shutter angle
180°
Shutter phase
Where the open window sits relative to the frame sample. Default is center (most CG / Nuke).
Open time
1/48 s
20.8 ms
Nuke / CG shutter
0.50
50.0% of frame · angle/360
Frame duration
41.7 ms
1/24 s
Shutter phase
Center
Open straddles the frame time (common default)
Rotating shutter disc
Cyan = open sector (light hits the film/sensor). Dark = closed. One full spin per frame.
One frame interval
41.7 ms · Center
50.0% open · 1/48 s
phase center · yellow = frame time
Motion blur preview
~17 px · 8 samples
Multi-sample integration: 8 time samples along the path while the shutter is open (open time × speed). Same idea as multi-sample motion blur in a renderer — not a CSS blur filter.
Subject speed
800 px/s
openTime = (180.0 / 360) × (1 / 24) = 2.0833e-2 s = 1/48 s · nuke shutter = 0.5000 · phase = center · Standard cinematic motion blur (180° rule)