So I had researched it a while ago and don't recall having found anything effective and non-suspicious to protect from public camera mass survaillence in cities and the like. Is there anything that is a good option for that yet, and if so, could you point me toward it?

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Yes that makes sense, the range finding sensor from an old cell phone should do nicely.
You can 3d print a geared lens barrel for small M12 lens quite easily.
Just map the values to real gear position and bingo's your uncle !

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