Hello Storch, and welcome to the friendly Camera Labs forum!
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Sorry for the late reply. I've tested the 400/5.6 Apo macro here
and found not the same probs as with the 300/4.0: at least I have a copy that works without AF fine-tune.
If you have any further questions regarding the 400/5.6 continue in that thread (or PM me).
Thomas (beware: Nikon-fanboy and moderator!) My Lens Reviews
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