https://en.wikipedia.org/wiki/Depth_of_field

There's a little bit of graphical explanation here:

https://en.wikipedia.org/wiki/Depth_of_field

Ansel Adams made a trilogy of quite excellent books on the camera, the film, and
the print.   He explains everything very well in my opinion.   Perhaps there is
something you can find on the web, but the relevant search terms would be "depth
of field" and "circle of confusion".

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