A comparator having first and second stages can provide component offset compensation and improved dynamic range. The optical compensation films may be processed by solution casting to yield a polymer film with high birefringence without the need for stretching, photopolymerization, or other processes. Translational andor rotational accelerations of the projector, of the camera system andor of the measurement object are measured here and, in dependence on the measured accelerations, the illumination of the measurement object surface andor the recording of the image sequence isare reactively adapted, in particular temporally substantially directly and live during the measurement process. A three-way split prism splits the synthesized light into a plurality of split lights.