1. A camera module array comprising: a plurality of lens modules; a first holder, the lens modules being threadedly coupled to the first holder; a plurality of image sensors in optical alignment with the lens modules in one-to-one relation; a second holder, the image sensors being received in the second holder; an optical element sandwiched between the first holder and the second holder; and an image processor electrically connected with the image sensors, the image processor being configured for processing image signals from the image sensors, and, accordingly, obtaining a compound image based on the image signals.