Clamping cameras with different rotation

Hi,

I have a following problem.

Consider Ortographic Camera (A) with no rotation. It's clamped to a calculated rect shape in XY plane.

Consider Ortographic Camera (B) with rotation of (30,45,0).

Now I want to clamp B so that when A reaches the end of it's rect shape (clamp starts to work), B stops moving as well.

The problem here is that while A moves only in XY plane, B moves in XYZ space, so the Z needs to be clamped somehow.

Both of the cameras move together at the same time and are perfectly synchronized until A reaches it's bounds.

Could anyone recommend something? Thanks!