How do you make a sharp image?
It starts with absolute stability.
I found my 7-year-old video (2010) on that page fascinating to watch as a demonstration of just how critical absolute stillness is to making a sharp image.
Absolute stillness of the camera is much more relevant today since pixel counts are higher with much smaller pixels. Technologies like pixel shift count on absolutely no movement or all heck breaks lose.
* No eidetic memory even for my own writing!