Be honest … have you ever used those additional spots on the Mode Dial? That C1, C2 and C3 are called Custom Functions and they can be a real time saver.
Basically, Custom Functions will take a snap shot of all the settings applicable to one of the other Modes (P, TV, AV, M or B) and store them either C1, C2 or C3. It includes your AF Focusing mode as well as your Video Capture settings. Once the Custom Function is set, you can continue to tweak the settings … like add a Picture Style of Monochrome to shoot stills and/or video in B&W. You could now switch very quickly between color and B&W photography. Pretty cool!
1. Camera User Settings.
It seems every Canon introduces a new way to set Custom Functions. The Canon 7D is no different. By default, each of the Custom Functions starts at the camera default settings. If you are happy with the way you have customized the settings on the Canon 7D, you will want to copy those setting to a Custom Function to begin. Start with the 3rd Wrench Setting in the Menu and use the Multi-Function Controller (joystick) to cursor down to the Camera user setting then press the Set button.
2. Register the Settings.
The first step in the process is to Register. Cursor to Register and press the Set button. (Should you later want to erase these settings, you will also see the option to Clear Settings on this screen too.)
3. Select the Dial Setting for the Custom Function.
Which Dial Mode setting do you want to use? Cursor to either C1, C2 or C3 on this screen and press the Set button.
4. Confirm and you’re done.
Finalize the Custom Function with the OK selected and press the Set button.
5. Update these setting as you go by repeating these steps.
With these settings in place, you can now make additional changes like setting the Picture Style to Monochrome and repeating the above steps to further customize the Custom Function. You now have two completely different setting groups available on your Canon 7D. By following these steps, you can now quickly switch between color and B&W photography just by turning the Mode Dial.