Shutter speed in video mode, 30, 60 or 100?

Question

Photo

Good morning, please.
When it comes to photos, everything is clear, but video.
We always have the shutter open and do not close, but at the same time, reducing the shutter speed increases the light.
Our frames are also fixed, 25 per second.
Why and what is the optimal value?

Answer 1

Exposure - the time the shutter is in the open state. So 1/30 second, 1/60 second and 1/100. The slower the shutter speed, the less light will hit the matrix, but the less the picture will be blurred due to the movement of objects and the camera. More than 1/25 when shooting at 25 fps cannot be set, since exactly so much falls on one frame. If the lighting allows, it is better to set 1/100 for clear shots. At dusk, it is better to set more, 1/25, for brighter shots