Quote:
Originally Posted by old_tv_nut
HDTV was designed to be viewed at about 3.5 times picture height, confirmed by viewing tests with untrained subjects. Farther away you lose some benefit of the resolution, closer there is no more detail to be gained.
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Somehow I had missed your post on my previous visit. This makes perfect sense. I expect that they were referring to full 1920x1080 HDTV rather than the mid-level 720p (1280x720) used by Fox, ABC, and some others.
Based on that, of course, then UHD/4K, with twice the resolution in both directions relative to 1920x1080 HDTV, will be ideal at 1.75 times the picture height, assuming that everything works in a linear way. I am probably sitting about two times the picture height away from my 77-inch-diagonal screen, so that is pretty close to ideal I think. And, yes, I can easily see the difference among 4K, 1080i/p, and 720p at this position.