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Message: <blockquote data-quote="Fred Kingston_RIP" data-source="post: 764225" data-attributes="member: 10742"><p>That would make sense to me Cindy.  If all your images have AF Fine Tune turned ON... then trying to analyze image sharpness between the two states would be impossible. AF Fine Tune adds a focus bias... If all images are from the same state "ON"... then it becomes impossible to determine exactly what bias is being applied from one lens to the next and whether the AF Fine Tune is even actually working.  IOW, if your AF Fine Tune for lens X is a +5, is it really adding a +5 and NOT a -10?  Or if is a +5, is it really even adding a +5 at all?  Without the camera and lens in hand to test, it would be difficult to determine without two images, one with +5 and one with AF Fine Tune OFF or at base 0...</p></blockquote><p></p>