Do SLR cameras usually take pictures automatically or manually?

Cameras are classified into aperture priority mode (AV).

Shutter Priority Mode (TV)

Manual exposure mode (m)

And a fully automatic mode.

There is also a programming mode (P)

If the SLR camera uses automatic mode when taking pictures, there is no need to buy a fool camera.

Generally, semi-automatic mode is adopted, such as aperture priority or shutter priority mode.

When shooting a fast-moving object, first use the shutter and set a shutter value, and the camera will automatically set a suitable aperture value, which is semi-automatic.

When shooting landscapes or portraits, you usually use aperture priority mode, set an aperture value, and the camera automatically sets the shutter speed.

Manual gear means that the shutter and aperture are set by yourself, which is a test of photography technology, and most people can't use it well.

That's usually the case.