Originally Posted by Hans Gruber
...Does anybody know the resolution of the living world around us?
The resolution of the living world is practically infinite. With the proper equipment, we can see matter that is smaller than an electron. Theoretically, with a camera capable of infinite resolution and infinite storage capacity, you could place the camera on the edge of the universe, take a picture that encompasses the entire universe and, even at that scale, the camera would capture every detail of every partical in the universe, such that we could then zoom in on any region of the photograph we want and see the atomic structure of an object on the opposite end of the universe. Of course, since the speed of light is not infinite, the object you are looking at would actually have existed nearly an eternity ago.
Originally Posted by Hans Gruber
At what point will high end SLR camera's exceed the resolution of the real world the human eye sees?
They already exceed unaided human vision. Ever taken a picture, pulled that picture up on your camera's display, and then zoomed in on a small part of it? You will see details that could not be seen by the naked eye at the time you took the picture.
That said, neither of the above really address the question of what the practical limit for display resolution should be.
Try this test...Place your hand in front of your face and slowly move it towards and away from your eye. If you are like most people, you will notice that you can actually resolve more detail in your hand when it is 6" from your eye than when it is 1" away from your eye. Human eyes have a limited focal range. Once you get inside of that focal range, your ability to resolve detail is actually diminished the same as if it were too far away. This is important to note, because it means that there is a limit in how close you can get to a display and still be able to focus on the image being displayed. Now, assuming you get as close as you can to a display without the image going out of focus, you can test to see at what point the number of pixels per inch exceeds your ability to resolve an individual pixel. Bear in mind that display resolution alone does not determine the number of pixels per inch. The size of the display is also a factor. The larger the display, the greater the display resolution must be in order to maintain the same number of pixels per inch. For small displays, such as smartphone screens, 4K already exceeds the limits of what the human eye can see at a viewing distance of 6". However, for a 65" display, you can easily make out the individual pixels at that close of a viewing distance. Then again, you can't really focus on the entire image being displayed on a 65" screen when it is only 6" away from you. For a 65" screen, if you want to be able to focus on the entire image at once, while still being as close as possible for the desired immersion, you should be at least 4 feet away from the screen. Unless you actually intend to focus on only a small portion of the display at one time then, not only are the size of the display and number of pixels per inch factors in what the display resolution should be, but ideal viewing distance also comes into play.