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I've re-read Marlanne's workaround and it still confuses me (maybe I'm just slow). Her example of de-focusing slightly followed by coming up with a value of 4 is clear enough BUT the next step starting with "Then put the lens back at perfect focus" does not make sense. Putting it back to where you started just sets the AF range back to over +/-20 so how would it now come up with 15? Just does not make sense to me.
Could you explain? I've added the text from her workaround below so others might benefit.
Offset the lens focus a bit, so the AF fine-tune values that give you the two rangefinder transition points will be closer to 0. Then you can determine how many fine-tune values it takes to move from one transition point to the other.
For example, if you defocus the lens slightly so that the AF fine-tune values at the limits of the "green dot" are at +2 and -6, then you know the difference is 8. Half of that difference, or 4 away from either transition point will be the correct adjustment.
Then put the lens back at perfect focus. Find the fine-tune value at the available transition point. Your ideal fine-tune will be 4 values further away from 0; that is, if a fine-tune of -15 brings you to the edge of the "green dot" range, the ideal value will be -19.