The problem with dot tune is that it only works when the 'correct' MFA number is relatively close to zero. And the same lens is dead on with a +4 setting on my 5D Mark III. When I set it to -17 (for the 85L II for example) on my 1D Mark IV, then the lens focuses dead on. If the focus conformation does not work in that range then I would send that lens to canon. Well, it has worked for all my lenses from the zeiss 21 to the Canon 600mm f4 l ii with 2x converter.
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