Maldon High Street in 2003

Speed Ramping
Many ads and feature films these days use a process described by industry insiders as "speed ramping" in which onscreen characters and events are shown to suddenly speed up and slow down. It is a "look" which for filmmakers and critics of my generation (over 35) is associated with experimental and avant-garde film, particularly the types of films made with Bolex and Arriflex 16mm cameras which enable real-time shutter speed manipulation while the camera is running. When you film someone at 24 frames per second, and then slow the frame rate down to 12 frames per second while the camera is running, two things happen. 1)The person appears to speed up (fewer frames to cover the same action means that at a constant frame playback rate of 24 fps the action appears faster); and 2) unless the aperture of the camera is altered to keep the exposure consistent with the frame rate, the film gets overexposed, as more light is allowed to land on the slowed down film.
David Cox

Anything That Moves: Armed Vision. Jordan Crandall