I just ran across a movie that just misses the usable focus range but I can see that something just starting to come into focus below the surface. Although I can't verify that it is a track, should I mark it or hit the bad focus button?
If it's coming into focus at the bottom of the range and doesn't seem to be an effect from something on the surface, I click it rather than Bad Focus. If there isn't anything coming into focus and the range seems too short, I click Bad Focus.