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<blockquote data-quote="dieselnutjob" data-source="post: 845207" data-attributes="member: 47318">HiThe focus module on my Nikon Df seems to be &quot;off&quot;, with some lenses needing to be maxxed out to -20, and all of my lenses needing fairly hi negative numbers on this body.So I tried a bunch of my lenses on my D780 as it has the auto AF fine tune feature.One lens was interesting because my 50mm f/1.4 AF-D lens scored a perfect zero, so as far as the D780 is concerned it's already perfect and need no tuning.The kit 24-120 f/4 was one of my worst lenses on the D780.So in theory if I mount the 50mm f/1.4 AF-D on my Df, zero the fine AF, and then adjust the three screws that adjust the AF module until it focuses perfectly, then this will set the Df to be the same as the D780.I am just wondering if there is another way to test this 50mm f/1.4 to see if it really is perfect?Because scoring a zero on the D780 just means that whatever imperfections this lens has are balanced by an equal and opposite imperfection on the D780?is there a way to know?thanks</blockquote>

[QUOTE="dieselnutjob, post: 845207, member: 47318"] Hi The focus module on my Nikon Df seems to be "off", with some lenses needing to be maxxed out to -20, and all of my lenses needing fairly hi negative numbers on this body. So I tried a bunch of my lenses on my D780 as it has the auto AF fine tune feature. One lens was interesting because my 50mm f/1.4 AF-D lens scored a perfect zero, so as far as the D780 is concerned it's already perfect and need no tuning. The kit 24-120 f/4 was one of my worst lenses on the D780. So in theory if I mount the 50mm f/1.4 AF-D on my Df, zero the fine AF, and then adjust the three screws that adjust the AF module until it focuses perfectly, then this will set the Df to be the same as the D780. I am just wondering if there is another way to test this 50mm f/1.4 to see if it really is perfect? Because scoring a zero on the D780 just means that whatever imperfections this lens has are balanced by an equal and opposite imperfection on the D780? is there a way to know? thanks [/QUOTE]

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