Disclosed is a system configured to operate with a hand-held camera. The hand-held camera is configured to operate with a film cartridge. The film cartridge defines an opening to enable entry of a driven film-feeding member into engagement with film edge perforations, the film-feeding member being driven by the camera for movement in a rectilinear path whereby successive film edge perforations are engaged so as to intermittently move the film past the exposure aperture. The system comprises a housing configured to be moveably engageable with the camera, in place of the film cartridge; a detector configured to generate a first signal in response to detecting a movement of the film-feeding member; and circuitry configured to write signals from an image sensor into the memory, according to an addressing mechanism that is responsive to the first signal.