The settings allow you to take advantage of security settings to prevent unauthorized people from accessing your file

The Screen Saver settings allow you to take advantage of security settings to prevent unauthorized people from accessing your file.
There is an option in any computer nowadays using Windows or Mac OS to write a username and a password each time you turn on a computer. A person who doesn't know your password won't be able to access your files, so this is a good security option.

By putting your camera into shutter speed priority. this way camera will automatically adjust the iso and the aperture in accordance with the environment.

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