I recently flew an Epic on a Zephyr and had some serious shaking issues. The rented rig didn't come with enough weights to properly keep the bottom end heavy, so we fitted a circular 5lb weight to the post and it worked perfectly in all of our tests.
We had two Steadicam shots that day, and the first, a low-mode shot following the hand of a character went flawlessly, but the second shot had one issue that may have ruined the shot. The shot was a high angle (tilted ~30 degrees) running shot for about ten yards to a lock off, a few booms, then a walk in to a lock off. The entirety of the second half was perfect, but the running had some terrible shaking throughout it. If they were just footsteps, I would have understood and learned from my mistake, but they were consistent throughout the movement, not just when I stepped. The ground was awful; our location was an ally in complete disrepair. It looked like it had never seen a full, even state in the history of the city, and was instead patched with lazy pothole fills. This didn't stop the first shot from being completed as planned, though. We did 27 takes of this shot and the problem was in each take, but we had a hard out fast approaching, and nothing immediately stood out when I docked. While watching dailies the 1st AC suggested that it was something in the build on top and took responsibility, however, I want to be sure so that this doesn't happen again.
Issues that I think may have caused this:
-weight on the bottom of the sled possibly being loose
-loose parts on the camera
-operation issues (what could have caused constant shakes from operation? trying to hold the angle?)
I really appreciate any advice anybody can give me about this.
This is the best shot I have of the build from our tests; I don't know if this is going to be enough to tell what's wrong..