

As a real life example, the Canon 600mm F11 telephoto lens should be awful, on, say, a 32MP crop sensor R7. That’s insane pixel density somewhere in the ballpark of this Fuji.
…But look at real life shots of that exact combo, and they’re sharp as hell. Sharper than a Sigma at F6.3.
The diffraction limit is something to watch out for, but in reality, stuff like the lens imperfections, motion blur, atmospheric distortion and such are going to get you first. You don’t need to shoot at F4 on this thing to make use of the resolution, even if that is the ideal scenario.










There are already phone apps that try to do this with WiFi/Bluetooth scanning, object detection, red “filters” and so on.
Theoretically, it’d be really cheap to make a tiny “detector” camera; maybe a Bluetooth earbud looking thing on one ear? Every existing tiny camera can pick up infrared if you just take off and change the filter, and your phone can run tiny object detection algos with almost no power.
The problem is mass adoption.