https://www.studiobinder.com/blog/what-is-rolling-stutter

Rendering rolling shutter in Arnold

Rolling_shutter is used to simulate the type of rolling shutter effect seen in footage shot with digital cameras that use CMOS-based sensors such as Blackmagics, Alexas, REDs, and even iPhones. This method is implemented by rolling (moving) the shutter across the camera area instead of the entire image area all at the same time.

https://help.autodesk.com/view/ARNOL/ENU/?guid=arnold_user_guide_ac_cameras_html