To set up and use custom settings (C1, C2, C3) on your Lumix camera, you’ll need to access the “Cust. Set Mem.” feature, typically found in the setup menu of the camera. Here’s a general guide on how to create and utilize these custom modes:

1. Set the Mode Dial: Switch the mode dial on your Lumix camera to the setting you want to customize (such as Aperture Priority or Shutter Priority). Configure all the settings as desired, including ISO, white balance, and focus mode.

2. Access the Cust. Set Mem.: Navigate to the menu, usually under “Setup” or “Custom” settings. Here, look for “Cust. Set Mem.” which lets you save these configurations. Select one of the custom slots, such as C1, C2, or C3.

3. Save Settings: After choosing a slot, press MENU/SET to save the configuration. The camera will store all your current settings in the selected custom slot, which you can recall instantly by turning the mode dial to C1, C2, or C3. If you need additional settings, certain models (like the GX9 and G90/G95) offer expanded C3 slots (e.g., C3-1, C3-2) for more customized setups.

4. Using Custom Modes: When you turn the mode dial to one of these custom slots, the camera automatically applies the saved settings. If you make any changes during shooting, you can revert to the original saved settings by switching away from the custom mode and then returning to it.

5. Updating Custom Settings: If you need to modify a custom setting, simply adjust the settings while in the custom mode and re-save them following the same steps. This flexibility lets you adapt your custom modes as your shooting needs evolve without having to reset everything manually each time.

6. Managing Multiple C3 Options: On models like the Lumix G9 and S5, you can save up to three configurations under C3 (such as C3-1, C3-2, and C3-3), which is useful for varied scenarios, like different lighting setups or specific types of photography, such as portraits or fast-action shots   .

By following these steps, you can optimize your camera for quick access to preferred shooting settings, allowing you to switch seamlessly between different shooting environments.