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Message: <blockquote data-quote="J-see" data-source="post: 428711" data-attributes="member: 31330">What Don said.There are several methods to fine-tune but you need to use one of them correctly else your result might make things worse than without fine-tuning. You can only use one fine-tuning value for one lens and the cam will apply that correction automatically whether you afterwards shoot the lens at the shortest or longest focal length or at the shortest or longest focal distance. Even when it would be fantastic, it is currently impossible to set more values for one lens.The only reason why I check the shortest focal distance and infinity is to see if the correction does not affect the lens in such a manner I can no longer focus at one of both.You need to pick one distance to fine-tune at (which usually is prescribed as 50 times the focal length you tune) and go through the process at that distance only. After that you're done. I find 50 times the focal length highly impractical for long lenses (and don't see the logic in that multiplier) so I pick a distance that suits me best but that should never be too close or at infinity.If you're unsure any other distance will lead to correct tuning results, pick the 50*focal length as prescribed.One distance to focus during tuning and one focal length only. Anything else won't work.</blockquote>