What is the 'correct' viewing distance for a 24"x30" photograph of a galaxy, or cluster of stars, taken by the Hubble Space Telescope, when such galaxy is, for example, 10 billion light years away.
That's easy: far, far away from the print, so that the image appears as small as the galaxy does to the naked eye. Yes, this idea of "correct" viewing distance in the sense of same apparent (angular) image size as the photographer say, or WYSIWTPS ("What You See is What The Photographer Saw", but only if he was looking over the camera, not through the viewfinder) is very ill-fitted to the viewing of telephoto or macro photography. It might have some relevance to viewing normal to moderately wide-angle images.
Another case of the dangers of being rigorously PC (Photographically Correct).