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<blockquote data-quote="BF Hammer" data-source="post: 832780" data-attributes="member: 48483">You covered the obvious and some less-obvious trouble points.I do have that lens, the FTZ-II adapter but a Z5 body, which is a little bit newer than the Z6. Clearly abnormal behavior.You do have a focus button on the back. I am not saying you should switch to the back-button focus method, but try checking that operation next time you have the issue and before you try restarting the camera. Another thought I'm having is can you then grab the focus ring on the lens and see if the camera will acknowledge a manual focus?So it can be as simple as the wires soldered on to the lens AF switch have broken. Or more likely the solder is cracked and the contact opens and closes by jostling the gear. Manual focus should function if that is the case, but the back AF button would not. Testing extra things like that can help narrow the possible causes.</blockquote>

[QUOTE="BF Hammer, post: 832780, member: 48483"] You covered the obvious and some less-obvious trouble points. I do have that lens, the FTZ-II adapter but a Z5 body, which is a little bit newer than the Z6. Clearly abnormal behavior. You do have a focus button on the back. I am not saying you should switch to the back-button focus method, but try checking that operation next time you have the issue and before you try restarting the camera. Another thought I'm having is can you then grab the focus ring on the lens and see if the camera will acknowledge a manual focus? So it can be as simple as the wires soldered on to the lens AF switch have broken. Or more likely the solder is cracked and the contact opens and closes by jostling the gear. Manual focus should function if that is the case, but the back AF button would not. Testing extra things like that can help narrow the possible causes. [/QUOTE]

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