What is the function of cable release? Specific benefits?

Cable release is divided into wired cable release and wireless cable release.

Using cable release can prevent the picture from shaking and let you get clear picture quality; You can also create long exposure photography themes: car tracks, star tracks and so on.

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With the function of "two-way button", the electronic cable is released:

The camera can focus on metering half the time, and pressing the camera fully will open the shutter to take pictures.

Under the function of "Lock Door B" attached to the electronic cable release device:

Push and pull the B-door button up. When the B-door button is locked, the camera will realize focusing and long exposure. When the B-door button is reset, the shutter will close and the exposure will end.