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Abstract: At three previous TAGA meetings the author has presented papers on Lateral Diffusion (aka Translucent Blurring and Edge Loss) error. The method used for measuring this error was specific to one instrument and, in general, could not be used to determine the error characteristics of the many handheld portable instruments commonly used to measure printed products. This paper details the results of an investigation which revealed a relationship between measurements made with the sample moved back from the normal measuring position and the errors encountered when samples with various translucencies are measured in the normal manner with instruments with various illumination and viewing apertures. The discovery of this relationship holds the potential for determining corrections for lateral diffusion errors with 45/0 and 0/45 instruments without knowledge of the instrument aperture sizes and the sample translucency. At three previous TAGA meetings the author has presented papers on Lateral Diffusion (aka Translucent Blurring and Edge Loss) error. The method used for measuring this error was specific to one instrument and, in general, could not be used to determine the error characteristics of the many handheld portable instruments commonly used to measure printed products. This paper details the results of an investigation which revealed a relationship between measurements made with the sample moved back from the normal measuring position and the errors encountered when samples with various translucencies are measured in the normal manner with instruments with various illumination and viewing apertures. The discovery of this relationship holds the potential for determining corrections for lateral diffusion errors with 45/0 and 0/45 instruments without knowledge of the instrument aperture sizes and the sample translucency.