Render outside borders of camera


I didnt find anything about rendering a custom border on a camera setup, to extend the borders of the camera.
So it would be like the rendered preview, only in full fledged render. Are the camera borders resizeable?
Can this be achieved somehow or only by redefining the camera to encompass all that i need?

Here is an example. So lets say that is my camera , can i define the red border for full fledged cycles render that i can save in full resolution?

EDIT: Sorry, by some mistake i made this here, i wanted to open this thread in the Support/ Lighting and Rendering section :confused:

have u tried going to the render tab and changing the X and Y values on the resolution panel?