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Aug 19, 2020 at 18:06 comment added Michael C I understand your point, but if the tripod is flimsy, it doesn't matter how solid the ground is. There are plenty of potential sources of force that can move the camera. Long ago I had a friend that was doing a thirty minute exposure on ASA 25 film at night using one of those cheap Focal brand tripods from K-mart with the video pan lever and a crank that you turn to raise and lower the center column. He had forgotten to fold the crank handle back in to lock it. After about ten minutes we noticed the crank handle was moving at about the same rate as a clock's minute hand.
Aug 19, 2020 at 17:23 comment added Matt You're right Michael, however, considering the wording in the question I assumed we talk about a very stable setup.
Aug 19, 2020 at 13:41 comment added Michael C That statement in the manual assumes a stable tripod that is not moving at all. With the increasing popularity of "travel tripods" that are often used with the center column extended, that's far from always the case, particularly if the winds is blowing and even more so if a camera strap is attached to the camera and acting like a sail in the wind.
Aug 19, 2020 at 11:30 history edited Matt CC BY-SA 4.0
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Aug 19, 2020 at 9:09 history edited Matt CC BY-SA 4.0
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Aug 19, 2020 at 9:03 history answered Matt CC BY-SA 4.0