感謝各位的回覆了。
那時候第ㄧ個想到就是問一下ITO站長，因為他老早就開箱，我也只知道他有這支鏡頭，結果他的回覆是他沒這種狀況，我就趕緊聯絡松下，想說是不是有問題。
看樣子那跟鏡頭應該是沒有問題。
還是希望多聽聽其他人的意見呀~
以下是松下的回覆。

The result or comment we/Panasonic CCC in Japan have receivedfrom engineer group is;

1.The level of the lens you have sent us for investigation
is within the specification for this Lens without any additional items putting on the lens.(This was already informed to you.)
2.Confirmation degrees of no movemnt : within plus & minus 50 degrees without any additional items putting on the lens.Therefore,it may be possible to move up/down over the angle of plus and minus 50 degrees.
3.There is no adjustment to be tightening or softly(loosing)
due to assembled parts.
4.Whenever shooting an object by a Camera with the Lens regardless angles, hold the lens by hand then shoot it. Distance/focus between the Camera and the object can be adjusted manually and speedly aslo easily.