Variable speed photography includes (). A. high-speed photography B. low-speed photography C. accelerated photography D. frame-by-frame photography

In order to obtain special shooting effect, the frequency of the camera is often changed to shoot. The normal running speed of the film in the film projector is fixed at 24 frames per second, and the shooting frequency of the camera is also 24 frames per second. When the shooting speed exceeds 24 frames per second, we call it high-speed photography. When the shooting speed is lower than 24 frames per second, we call it low-speed photography. The camera only takes one frame at a time, which is called frame-by-frame photography.