Follow these steps:
- Open the Shooting menu and select File Naming, as shown on the left.This option enables you to change the first three characters of filenames.
You see the screen shown on the right in the figure. The current file naming structure for sRGB and Adobe RGB files appears on the screen.
- Select File Naming to display a text-entry keyboard.
- Enter three characters. Use the same techniques as you do when adding image comments, explained at the start of this chapter. The only difference is that this keyboard limits you to a single screen of numbers and letters. You can't use a space, underscore, or other special characters in the filename.
- Press the Zoom In button or tap the rightmost OK symbol at the bottom of the screen. You return to the Shooting menu; the File Naming option should reflect the changes you just made.