Abstract: Film copying apparatus especially for copying a negative film such as an X-ray film upon an underlying sensitized film by exposure to light rays for a predetermined timed interval. The apparatus comprises a four-sided frusto-pyramidal housing structure in which an outer housing formed from a folded sheet of plastic material and an inner housing of a light reflecting metal are secured in nested relation and coact to provide a light chamber having a bottom light transmitting opening that is spanned by a transparent light transmitting window.