1. A camera module, comprising: a plurality of lenses with different focal lengths; a supporting plate defining a plurality of through holes receiving the corresponding lenses; an image sensor comprising a sensing area configured for receiving light through the lenses and the through holes and converting the light into electrical signals; a spacer positioned between the supporting plate and the image sensor, the spacer defining a plurality of apertures spatially corresponding to the lenses; and a processor electrically connected to the image sensor, the processor configured for processing the electrical signals to form sub-images of a same view of same objects with different depths of field and then combining the sub-images into a final image.