Sony FX 6 Quick Start Manual page 154

Interval Recording and Time Lapse
You can also use interval recording to create timelapse sequences.
Menu/Project/ Interval Rec
The interval time is the amount of time between each exposure.
The number of frames is the amount of frames that the camera takes during the interval
time.
For example, an interval time of 1 sec and the number of frames being 2, this means the
camera takes two frames per second.
If you are shooting at 24p, then the camera takes 2 consecutive frames every 24 frames.
The shutter speed can be changed while recording in Interval Rec to create special effects.
Extending the shutter opening time can be combined with the interval time to create
blurry ghostly images of what is in motion.
If you are using auto exposure during time lapse, slow down the response time of the auto
exposure system: Menu/Shooting/Auto Exposure/Speed. Set to -40 or slower.