The ST4 is moving during my timelapse exposure

This can happen for a few reasons:

1. Make sure your cameras shutter speed is set less than your ST4′s static time.
2. Make sure your cameras shutter speed is set less than your ST4′s interval time
3. In general, understand the shot cycle – the ST4is smart, but needs your help to program it correctly. Your camera’s exposure time, the ST4′s intervals, and Static time are interrelated in a tightly choreographed dance we like to call – The Anatomy of a Single SMS Frame – Check it
   
   

Still having issue, then reach out to support with some good info and the following video.

Setup the following shot on a spectrum with the latest released firmware.
1)  Big Pan/Tilt that we can see actual movement on between shots (Say 45 degree pan and tilt.
2)  Interval 64 sec, Static Time 32 sec, Cam Exp time 30.0 sec. (or whatever combination was causing you issue.)  Record ALL the parameters and pass this back with the video
3)  Total shots, - 50
4)  Make sure AF is off on your camera

From behind, we need to see and HEAR the following video shot from behind the rig:
5)  We need to see the ST4 OLED screen, and hear the camera shutter for at least 10 cycles.  Keep in mind that if you have a processing issue, this will likely shot up later in your shot, not at the beginning.  Better yet, record the full setup showing the ST4 screen from startup.

We also want and need:

6)  The TL sequence from the camera that was doing the timelapse.

On review, we are looking for the indication that the spectrum is attempting to fire the cameras (upper right circles in the OLED screen) and seeing when and how quickly your camera responds.  If its not immediate, there is an issue, with camera not accepting trigger.  This will add up and cause issues as the move timing can then happen mid exposure.

We will also see how long your camera's 30 second exposure really is (its not always exactly 30 seconds), and how long your processing light stays on to give us clues.