1. A method to focus a camera, and the method comprising: using a processor to perform the steps of: performing a focus operation in response to a contrast value of an image on an image sensing member formed by a lens; adopting a first method to seek and find an optimum contrast value of the image during the focus operation; and adopting a second method to seek and find the optimum contrast value when the first method fails, wherein the first method is not equal to the second method.