Chicken or the egg? Could someone suggest key words to put in the search engine in order to find pet methods of matching lens to the shot composed in your mind.
Does one use their legs to zoom to a point selected by ... what? ... degrees, two right angled "L" composition aids, the Force young Skywalker, a coin toss?
This is a serious question: my wife and neighbors cast unfriendly looks when I'm out in the yard practicing with these L's. But the L's permit me to frame the shot's boundaries, and a compass reading on the boundaries gives the angle, and the angle can be matched to the lens. This seems the quickest, accurate way of getting the image on the ground glass.
Another method I've been using that is fast is to hold a tape measure out in front of me (both hands extended) with my thumbs on the boundaries of my composition i.e. the L and R vertices of a triangle (the third vertice being my eyes). I've marked the lens's length of the opposite side on the tape measure.
(The tape measure doubles when measuring reciprocity correction due to bellows extension)