1. A fixed-focus camera module, comprising: an image sensor; a lens for focusing an image onto the image sensor; and a positioning structure for maintaining an alignment of the lens and image sensor to provide a desired image quality, the positioning structure including a first unthreaded member coupled to the lens and a second unthreaded member coupled to the image sensor, one of the first and the second members configured to be inserted into the other of the members to provide an adjustable relative position of the lens and the image sensor.