1. An apparatus, comprising: a camera comprising an objective lens, wherein the objective lens is configured to refract light from a scene located in front of the camera to form an image of the scene at a focal plane of the objective lens; a film holder configured to hold a film and to be inserted into and removed from the camera; and a non-refractive periodic mask configured to be placed in the film holder against the film such that the mask is between the film and the objective lens of the camera and at the focal plane of the camera when the film holder is inserted into the camera, wherein the mask comprises an opaque medium with periodically spaced transparent openings on one surface positioned away from the film, and wherein the opposite surface of the mask is configured to be positioned next to the film; wherein the apparatus is configured to multiplex radiance in the frequency domain by optically mixing different spatial and angular frequency components of the light received from the scene and to capture the multiplexed radiance on the film.