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I guess first thing to do is try to categorically confirm that the lens is actually tightening up if held at a different angle, or is it your technique that makes it feel that way?
If it is tightening up, I'd talk to someone about it, a dealer, or Zeiss themselves.
If it's technique, well, just don't worry about it, and focus horizontally or get used to focusing vertically, or do both.
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