Is it possible to set different resolutions for cameras?

[Crab]

Is there an option in Blender to set different resolutions for cameras?
I want to use background images for cameras, but since they have different sizes only one becomes usable.

[joseph]

You could use drivers/markers to change those values when the camera changes, or you could write a script to do that dynamically

[Crab]

Is it possible to have two different resolutions simultaneously? Like in the pic above.

[DNorman]

@Crab

Is it possible to have two different resolutions simultaneously?

Not as far as I know of. You can have different “copies” of the scene each one with different cameras, background images and resolutions.

Also you can use the mapping in the background image tab (and compositor for render) set to fit or crop instead of stretch.