Spin Blur

Linux: /usr/fl/shaders
MacOS: /Library/Application Support/FilmLight/shaders

A radial blur that spins around a centre point

The effect can vaguely mimic the defocus of Petzval lenses.

Screenshot

Parameters

Center (X/Y): Moves the focal point of the blur. The area around this point will remain sharp.
Amount (Deg): The primary strength of the rotational blur, measured in degrees of rotation.
Aspect Ratio: Stretches the shape of the sharp center.
Falloff Radius: Controls the size of the sharp protected area in the center of the image.
Falloff Softness: Controls the transition distance from the sharp center to the fully blurred edges. Higher values create a very gradual roll-off.
Chroma Spread: Adds RGB color fringing to the blurred pixels.
Vignette Strength: Darkens the edges of the image based on the blur falloff.
Pre-Blur Factor: Applies a pre-blur to the edges before rotating them, effectively reducing stepping artifacts.
Samples: The number of rotational texture lookups. If you see individual steps or ghosts in the blur at high Amounts, increase this value to smooth them out (or increase the Pre-Blur Factor to save performance).”

Unzip and place files into the /vol/.support/shaders folder which is the same as