Quote Originally Posted by AgX View Post
I was refering to image distortion due to camera shake. It's a simple matter of geometry. And I spoke about "greater ability". Every movement of the camera will sooner or later influence the image. Furthermore it is a matter of kind of camera movement direction-wise.
Thanks for the reply. You seem to speak from theory, not from measurement. Bad theory, at that.

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.