Set these before you go out, and everything you'll need will be right at your fingertips all day, or forever.
Each time you turn the dial to one of the C1, C1 or C3 positions, everything is reset to what was stored in that position.
Feel free to change any settings as you shoot in the C1, C2 or C3 positions. You won't erase what you saved. These changes will stay until the camera times-out, usually one minute (you can change that duration in the menus), and the next time you go to shoot, even if you had changed something, you're back at your saved settings.
If you want to return to the saved settings more quickly, just move the dial to any other position and return.
To Save a Suite of Settings
To save a complete camera-state setting of your 7D:
1.) Set the camera as you like. Everything is saved.
2.) Press:
MENU > WRENCH ••• > Camera user setting > SET > Register > choose the C1, C2 or C3 position > OK > SET.
To Make a Permanent Change to a Stored Setting
To change a stored setting:
1.) Set the dial to that setting, C1, C2 or C3. This recalls the setting.
2.) Change something.
3.) Save the camera's current state back into that dial position:
MENU > WRENCH ••• > Camera user setting > SET > Register > Carefully select the correct C1, C2 or C3 position > OK > SET.
If you select the wrong C1, C2 or C3, you will have overwritten the settings at that position — oops! — so be careful.
To Make a Temporary Change to a Stored Setting
Just change something as you would anywhere else.
As soon as you select or re-select a C setting, or as soon as the camera goes to sleep and wakes up again, your originally saved C setting is recalled.
The C settings themselves are not altered unless you deliberately save something into them as described above.