Abstract: The invention relates to a photogrammetric rectifying device and a method for determining the setting values for the same to perform rectification. The inventional device has at least one measuring mark non-displaceably arranged within the projection beam non-coincident to the optical axis of the projection objective. The coordinates of the measuring mark are known. By displacing a negative carrier and adjusting the magnification, while the angular elements of orientation are held at their zero positions, control points of said photograph projected on an easel are brought into coincidence with corresponding measuring marks, which are provided on the easel. The displacements of the negative carrier and the magnifications are measured. The resulting values and the known coordinates of the measuring marks are used to compute the photo coordinates of the control points. The setting values are the results of a projective transformation computation, which is based on the photo- and map-coorinates, only.