Camera Shift in percentage ?

[olivier jeannel]

I'm making a picture which as to be 4158 * 3071 pixel, the camera is 
looking at an object that fits in that bounding plane.
Now the client ask me to render the same thing, but with 10% pixels all 
around more.
So What the camera see must not change, it just need to see 10% more around.
I'm supposed to shift the camera up in Y axis, but I believe there is a 
way to calculate that ?
Don't know if I'm very clear...


Olivier