Rin

Question 2 is the important one and the answer is that a shop vacuum is right for this machine and wrong for some others, so it depends what else you own.

The distinction is high pressure, low volume versus low pressure, high volume. A shop vacuum moves a modest amount of air at high suction through a narrow hose. A dust extractor moves a huge amount of air at low suction through a wide one.

A table saw's under-table cabinet produces a lot of chips and needs volume, so a shop vacuum is genuinely undersized for the cabinet. Where the shop vacuum shines is the blade guard port on top, which is a small opening capturing fine dust right at the cut — that is a high-pressure job.

Which means the ideal is both, and if you only have the shop vacuum, connecting it to the overhead guard often collects more of the dust that matters — the fine stuff that hangs in the air — than putting it on the cabinet does.

Three separate things are happening and they compound.

A photo is one instant, frozen. A real face is constantly moving, and your brain builds an average from thousands of micro-expressions. A photo hands you one of those samples at random. If the shutter caught the moment one side of the smile was ahead of the other — and it usually is, because faces are not synchronised — you get a lopsidedness that never existed as a sustained state.

A photo is flat. In person, depth cues from binocular vision and your own movement tell you a cheek is turned slightly away. Flattened into two dimensions, that turn reads as a smaller eye or a shorter side rather than a rotation.

A photo can be stared at. You never study a face for thirty seconds in life. Any feature survives a glance and very few survive scrutiny.

So it is not that the camera revealed something. It sampled, flattened and then invited inspection.

So the rule is real but it lives in the developing tank rather than in the camera. That makes far more sense than "you just can't".