1. An imaging device, comprising: an imager including a sensor and at least one optical element to focus light on the sensor; a multiplexing assembly that divides a pupil area of the imager into a plurality of continuous sub-pupil regions that each define an image channel; wherein the multiplexing assembly simultaneously directs light of a same spectrum from each of the image channels onto the imager such that light from each image channel forms an image on the sensor that fills a focal plane of the imager and the image overlaps with images formed by other image channels.