Thanks for the reply. You seem to speak from theory, not from measurement. Bad theory, at that.
Originally Posted by AgX
Shake doesn't cause distortion, it causes blur.
The effects of movement (subject and camera movement are equivalent) depend on magnification, not on focal length. I don't know how old you are or how bad your tremor is. Mine is under good control, but I wouldn't shoot closeup handheld when using available darkness for illumination. When working closeup, shoot from tripod or or use flash or get motion blur. That's the law.