I came across this article http://www.trenholm.org/hmmerk/DOFR.html and I'm a little confused now. "The general rule for scenic photographs, where one wishes to maximize the depth of field, is as follows. Set the focus at the distance of the most distant object. Then set the lens opening to the size of the smallest object to be resolved in the foreground. No calculations needed!" Does this make sense? can someone explain it with more detail please.