Paul,
A few questions for you while you contemplate if you have any video to upload, per the suggestion of
@Ty Pilot.
- How old is your H520 and E50?
- Is this the first time you have noticed the phenomenon ask you describe?
- Do you happen to notice if there is a particular position (angle) of the camera, where this wavey or jello video is observed?
- Have you been able to perform any tabletop testing?
If you search for E50 using additional keywords such as vibration, vibrates, jello, buzz (likely need to try those keywords individually), you should find some historical conversations. The one I am going to ask you to investigate, specifically question 3, is relating to this camera "buzz".
To test to see if you can reproduce the symptom, try the following, with your H520 sitting indoors, on a level table. No need to have the props spinning, so feel free to remove them for safety. Also, you don't have to be recording, but feel free if the subject matter is safe for public consumption. The video might coincide with any vibration or buzzing you may encounter.
1) Set the camera angle to zero (horizontal).
2) Change the angle, slowly, toward 90 degrees (down)
Listen for vibrations from the camera (buzz).
If not observed, move to the next test:
1) set the camera angle back to zero
2) Using the pan knob, start a slow pan
3) listen for vibration
4) if no vibration observed, keep the pan going. Slowly change the camera angle toward 90 (down).
5) listen for vibration.
If you hear the buzzing during any of the tests above, it is not a flight or wind issue, but more than likely a gimbal balance issue. The fixes have been everywhere from firmware, to changing the dampers (one of my E50 cameras was fixed using CGO3+ dampers), to counterweights. The counterweight instances were reported more on the E90 and C23 (H Plus). I have not heard of counterweights being used on E50 cameras.
Another clue: from my own observations as well as posters here, the buzzing typically occurs when the camera angle is dropped around the 30 degree mark, or lower. Not everyone has reported angle, but worth mentioning.
Please keep us informed so we can learn as well as possibly help further.
Good luck!
Jeff