Abstract: A resolving cone-axis camera which imparts an additional translation motion to the film as the diffraction spots from the precessing crystal impinge upon the film. This translation motion is in the plane of the film and is such that a predetermined offset point on the film is caused to move along a circular path having the intersection of the crystal axis and the film plane as its center. The additional motion of the film results in a photograph having concentric annuli of given width formed by the diffraction spots from successive levels of the reciprocal lattice. The distance between the chosen offset point and the crystal axis intersection point determines the width of the annuli, and the offset point may be chosen at any point on the film which is within a circle having the crystal axis intersection point as its center and having a radius equal to the distance between the crystal axis intersection point and the beam axis intersection point.