Sony Alpha 7 III Help Manual page 616

Interchangeable lens digital camera

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Interchangeable Lens Digital Camera

Set File Name

You can specify the first three characters of the file name for images you shoot.

(Setup) → [Set File Name].

Select the entry field for the file name to display a keyboard on the screen, and then enter three characters

of your choice.

The setting for [Set File Name] will be applied to both slot 1 and slot 2.

Only capital letters, numbers, and underscores can be entered. However, an underscore cannot be used as the first character.

The three characters of the file name you specify using [Set File Name] will only be applied to images you shoot after changing

the setting.