Help! I'm anxious. What is the purpose of the high-speed film of the camera?

The high-speed film of a camera refers to the photosensitive film above iso400. Movies can be played slowly at any magnification of the standard TV system, and the pictures can be searched automatically without post-processing. It can improve the photosensitive speed and is suitable for using or shooting high-speed moving objects in dark environment. Mainly used in scientific photography, sports photography and news photography.

Extended data:

In this camera, the negative film is fixed on an approximately circular frame in the camera box, and the imaging beam is swept across the negative film with a rotating mirror at high speed. If a row of small lenses are placed in front of the negative, when the light beam sweeps them, an image will be formed on the negative, forming a so-called framing camera.

If a slit is set in front of the optical system, the target is imaged on the slit and imaged on the negative through the rotating mirror. When the rotating mirror rotates, a strip image will be formed on the negative. The width of the stripe indicates the change of the linearity of the target along the slit direction with time, and the blackness of the stripe indicates the change of the luminous intensity of the target with time.