Just the other day a friend asked about the stability of tripods, so I thought I would try a “quick and easy” test…
The 4-6 thousandth of an inch movement is down to the weight transfer of me moving my iPhone to make the video.
If I was to do all the maths, this rotational movement would be a significant shift in any image using a very long focal length lens at full distance.
This takes me back to the days of when I visited optics manufacturing companies (Germany
) and they told me of the lengths they had to go to, so that ground vibrations were minimised. 
The 4-6 thousandth of an inch movement is down to the weight transfer of me moving my iPhone to make the video.
If I was to do all the maths, this rotational movement would be a significant shift in any image using a very long focal length lens at full distance.
This takes me back to the days of when I visited optics manufacturing companies (Germany
) and they told me of the lengths they had to go to, so that ground vibrations were minimised. 

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