Apparatus for recording on a black & white photographic film information representing a pattern of coloured light, wherein the apparatus comprises at least a housing with an opening through which, during use, the coloured light enters the housing, wherein the housing comprises within the housing a substantially plane-like position which is, during use, occupied by the black & white film, wherein the apparatus further comprises a mask positioned in a light path extending from the opening to the plane-like position, wherein the mask comprises at least one set of colourfilters, wherein each set comprises at least two colourfilters having different predetermined wavelength transmission characteristics, characterised in that, the mask further comprises separate from and in addition to the at least one set of colourfilters at least one identification mark which is projectable onto the black & white film, wherein the position of the at least one identification mark corresponds according to a predetermined relationship with the position of at least one set and/or with the position of at least one of the colourfilters.