Peter…
I'll answer by way of examples used on my R5:
- C1 : my choice of how the camera is set for landscape / general
- C2 : my choice of how the camera is set for macro
- C3 : my choice of how the camera is set for birds in flight
- Choosing C1 (general) will instantly set Tv and Av to manual (1/500 & max aperture), ISO to auto, shutter to electronic first curtain, drive to single.
- Choosing C3 (birds in flight) will instantly set Tv and Av to manual (1/2000 & max aperture), ISO to auto, shutter to electronic, drive to H+.
By contrast
My Menu provides shortcuts to your 'favourites' in the Menu system—no need to hunt for where 'Format Card' or 'Customize Buttons' are because you've assigned each to one of the six choices in My Menu.
Please note that you can have multiple groups of six My Menu favourites.
… David