Enables/Disables motion blur
If a Motion Vector AOV is enabled in your scene all Redshift motion blur will automatically be disabled in the beauty render as this would be undesirable for a Motion Vector AOV.
For more information on AOVs, please see here.
Enable Deformation Blur
Deformation blur (tracking the motion of vertices) can be memory-intensive especially for high-poly or displaced geometry. For this reason, it has a separate switch to enable/disable. If most of your scene's motion is due to rigid body animation or camera movement, you can leave this option disabled.
Real-life camera shutters don't open instantaneously – they open gradually. The 'shutter efficiency' parameter controls how fast the shutter opens. A setting of 1.0 (the default) means the shutter will open instantaneously, while a setting of 0.0 means that it will open as gradually as possible. The images below show how the shutter efficiency parameter efficiency affects the shutter opening speed.
The shutter efficiency can affect the look of motion blur trails. The lower the efficiency, the 'softer' the motion blur trails.