Great image, nice article. But don't you narrow down previsualization a
bit too much in the last paragraph when you contrast it to autofocus
and autoexposure?

When I do candid portraits, I always know exactly what facial
expression I want to catch - somehing that I have decided is
characteristic for this person for this or the other reason. But just
because it is characteristic it doesn't have to occur very often - just
more often than in other people. And it is sometimes a very fleeting
moment in time - a particular type of quick smile, that has to be
captured in exactly the right fifth of a second, in a worst-case
scenario.

For these kinds of previsualizations, I feel that autofocus and
autoexposure are not something that detracts from, or diminishes
previsualization, but a necessary condition for the previsualized image
ever to be captured.

I know, as exactly as you, what I want to capture. I want to capture a
particular facial expression of a person whose moving aboutI can't, and
don't want to, direct.

And at least on my technical level, in the general case this simply
isn't possible without autofocus and autoexposure.

Jan Böhme