How to set the aperture, shutter and sensitivity when taking low-key photos?

Turn the aperture to the maximum.

Adjust the shutter speed according to the movement requirements.

Because ISO is a double-edged sword, if it is set too high, noise will ruin your photos. If it is low, it is easy to be underexposed or the shutter speed is too low for you to hold. If you don't hold it, you can use a tripod. You just can't keep a low profile.

The maximum aperture is to ensure the amount of light entering. Generally, the environment for low-key photography is relatively dark. A larger aperture means lower requirements for sensitivity and shutter speed.

As for why the shutter speed should be adjusted according to the action? Because the shutter speed can't be too fast or too slow. Shutter speed is too fast, which requires a high-sensitivity lens or a larger aperture. The higher the ISO, the greater the impact on image quality. Too slow shutter speed will cause paste.

As for taking pictures like paparazzi, you need a professional time machine or sports machine. Automatic ISO shutter priority high-speed continuous shooting automatic server focus is used, and the rest are squatting.