THE WEST WING used its first SPLIT DIOPTER SHOT in Season 1, Episode 11 on my birthday, January 5, 2000.
After President Bartlet rips into the CIA director, the camera holds both men in perfect focus. Bartlet is still furious. The CIA director is clearly humiliated.
A split diopter lens keeps two subjects at different distances in sharp focus within the same frame.
Often used as a visual gimmick, here it serves the story.
Two men. Two emotions. One shot.
Elegant filmmaking.