Graticules for Canon Cameras

Does anyone know whether it's possible to change the graticule in a Canon 5D, or any other Canon camera for that matter? I know from my past life that it was possible change the graticule in a cine camera in order meet aspect ratio requirements. I wonder whether this can be done Canon cameras...

You might better define what YOU mean by 'graticule'.

From my own personal experience with the term I would say 'horizontal & vertical grid lines' or it might mean 'central measurement scale' like, from a rifle marksmanship context, the mil marks in a rifle scope.

The 'grid' can be found in the focusing screens offered by Canon, such as the EE-D, for help in keeping perfect the horizontal or vertical features in a scene.

You can display a grid, with assorted options, in the 7D, 5D2 and later "semi-pro" or better offerings. Check the User Guides (available on-line) and look for "Grid". The 5D2 and 5D3, as well as the 1D series offer interchangeable focusing screens as well as the grid displays.

Same goes for the 60D and 6D...............