C1 refers to custom settings for facial images; C2 refers to custom settings for intraoral images.
To configure custom settings for facial images:
Press the Menu button to enter the control menus.
Scroll right to select the yellow Setup Menu tab, which has the hammer and wrench.
Scroll down to the Power Saving menu and press Func/Set.
Scroll down and press Display Off.
Scroll left until 3 min. is displayed and press the Menu button to return to the main menu.
Scroll up until the tabs along the top appear red, yellow, and blue.
Scroll left to the red Rec menu, which has the custom silhouette.
Scroll down to the Review menu.
Scroll left until Hold is displayed.
Scroll down to the Custom Display menu.
Press Func/Set to enter the sub-menu.
Use the scroll direction and Func/Set button to select the Shooting Info and Grid Lines options for 1 and 2 columns. Leave the other options blank.
Press the Menu button to return to the main menu.
Scroll down to the Save Settings menu.
Press the Func/Set button. Scroll right until C1 is displayed, and press Func/Set to save the setting for the C1 mode.
Press the Menu button to return to live camera view.
To configure custom settings for intraoral images:
Press the Macro button, and scroll right to highlight the flower. Then press Func/Set to save.
Press the Metering/Light button, and turn the Control dial to set the Metering Mode to Evaluative.
Move the Zoom Lever to set the zoom to 8.5X. Press and release the Zoom Lever to the right twice. After a few seconds, the zoom factor is displayed. If it is not 8.5X, press and release the zoom lever to the right to increase the zoom factor or to the left to decrease the zoom factor.
Press the Menu button.
Scroll up to the Save Settings menu.
Press the Func/Set button. Scroll right until C2 is displayed, and press Func/Set to save.
Press the Menu button to return to live camera view.