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Image Quality And Modulation Transfer Function (MTF) For A 48 Inch Camera

The subjectively assessed quality of photographs taken with a 48 inch lens has been compared with the MTF of the lens measured in the same image planes. The image quality and associated MTF were varied by the through focus technique, using a range of image planes on both sides of the optimum. The photographs have been examined to ascertain the change in MTF, at the various levels, resulting in a just detectable difference in image quality, and whether a 'reduced' MTF could be used which would sensitively indicate the changes. The results will be used to provide MTF production tolerances for lenses used in aerial photo-graphy. They indicate that a measurement at a single selected spatial frequency should be sufficient to enable differences between lenses in a production batch to be monitored reliably.