By "Turn it off" Do you mean hiding it? Because if not, then you could just hide it, render, and press 'z' twice. Unless you're rendering alot then it shouldn't be too
much of a problem.
But there may be a way! Just wait for someone who knows more than I.
EDIT: Wait.. disregard that, because I didn't see it said camera image plane.
So I think that invalidates my suggestion.