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The precession method is extended to the back-reflection region and used to record distant upper levels. Nets fulfilling the equi-inclination condition ζ = 2 cos [unk] are photographed without a central blind spot. The back-reflection cone-axis technique records nets with ζ [unk] 2 cos [unk]. Due to the mechanical design of the camera, cone-axis patterns are taken by an uninterrupted precession motion; isolated nets are taken by precession oscillations.

Back-reflection precession camera, a new instrument in reciprocal-lattice photography