Abstract: A method and apparatus for measuring light reflections of an object, comprising a light-source illumination-observation assembly, the assembly comprising: (A) an illumination unit comprising an illumination light source and illumination aperture stop being arranged to provide a confined luminous field, an illumination field stop (307) adapted to provide an illumination beam (305) of light from said confined luminous field, an collimating optical element (309) adapted to collimate said illumination beam and to provide an illumination field (313) on an object; (B) an observation unit comprising: at least one observation field stop adapted to provide an observation beam (306) comprising a ray boundary, at least one focusing optical element (309) adapted to focus said observation beam, an observation light receiver; and (C) at least one common optical element (309) arranged so that said illumination beam and said observation beam form an overlap therein; and (D) a unit separation stop (310) adapted to stop light

Abstract: An area exposure machine for reproduction equipment and comprising an oblong light source (1) and a reflector behind the light source. The reflector is shaped substantially as an involute curve. As a result a uniform exposure of a relatively large area can be achieved, and the distance between the light source (1) and the area to be exposed can be reduced. As reflections towards the light source are avoided the consumption of energy can also be reduced. The reflector is advantageously composed of planar surfaces approximating an involute curve, and each planar surface is advantageously wedge-shaped whereby a more uniform exposure is obtained. The area exposure machine can for instance be used in connection with a contact printing box.