![]() Using a repeatable quantitative methodology to calibrate the optimal AFFA settings, most of the eleven lenses in the procedure were found to require new AFFA settings for optimal AF performance. This article describes the changes in the Autofocus Fine Adjustment (AFFA) settings that were necessary after the author updated the firmware in a K-3 Mark III DSLR camera from version 1.01 to v1.31 in December 2021. It is believed that sufficient numbers of AFFA test runs were conducted to support a robust analysis. It is possible that several minor AFFA changes could have been prompted by a margin of error in the test methodology, depth of field allowances, or tolerances in the camera's AF system. Five settings would have been at the margins, i.e., just barely acceptable or slightly blurred. Notably, ten of the eleven lenses would have been within an acceptable focus tolerance using the original AFFA settings under FW 1.01, although not necessarily optimal. ![]() Edit: After further testing and analysis, some of the conclusions have been revised.
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