Why do DSLR videos sometimes have ripples and jumps?

If the refresh rate is not much lower than the strobe, ripples will appear. If it is not too much higher than the strobe, the video will flicker more obviously.

The solution is to avoid using stroboscopic light sources, such as incandescent lamps.

Causes for ripples:

Each frame of the video is refreshed line by line, for example, from top to bottom. Therefore, if the refresh rate is slower than the stroboscopic, then when refreshing to a certain position, the light source will flash off, the screen will go dark, and then flash again, leaving a horizontal black band during the refreshing process.

Black bands appear in different positions in each frame due to the above reasons. When connected together, they look like black bands that are constantly beating. The width of the black band and the speed of beating are related to the number of frames and the frequency difference of the strobe.

Extended information

What is the role of aperture?

1. Control the amount of light, which directly affects whether the picture can be correctly exposed and is the key to successful shooting. ;?

2. Control the depth of field. The smaller the aperture, the greater the depth of field. Although the focal length and shooting distance both affect the depth of field, changes in the focal length and the distance of the subject will also affect the composition. If the composition is determined, the only weapon we can control the depth of field is the aperture;?

3 . Aperture affects the clarity of the picture. Any lens produces the best image (the clearest picture) at a medium aperture. The resolution is poor at the maximum aperture and minimum aperture;?

Behind 4.F The smaller the value, the larger the aperture, and vice versa. For example, the aperture represented by F1.4 is larger than the aperture represented by F11.

Reference: Single lens reflex camera_Baidu Encyclopedia