Originally posted by Fogel70 Yes, I think both rotating the camera and zooming the lens, maybe by holding the zoom ring fixed while rotating the camera.
Shooting with a camera is a lot like shooting with a gun. You want a slow controlled trigger or shutter release. If you jab at the trigger or shutter, the mechanism WILL move in response to the quick movement. And with a long shutter speed you are continuing to press down on the top corner of the camera.
I watch my wife do this frequently and I point it out to her when she blames her point & shoot camera. Her index finger is poised slightly above the shutter, she jabs on the button and barely allows the camera's auto-focus to work before releasing the shutter - and the camera moves during the exposure. Her full daylight shots are often okay because the shutter speed is high enough to compensate, but many of her lower light shots are not. It's a shame because her sense of composition is frequently better than mine.
For some people, it helps to stand in front of a large mirror so they can see themselves and practice their camera holding techniques. To the greatest extent possible, you want to use your own body to brace against to minimize camera movement while still being able to access the camera's controls.
Check out this guide:
https://www.pentaxforums.com/reviews/long-exposure-handhelds/introduction.html