Originally Posted by David Susilo
Theory... Theory... Theory.
Have you tried it yourself? I've had the 84" Sony 4K TV to calibrate and audition for several days viewed from 10ft away. Even when viewed at 14ft away you have to be blind for not being able to see the improvement of 4K over 2K. Heck, 2K at 84" from 10ft away is only barely acceptable to my eyes.
Well, then the guys as S&V don't know what they are talking about either. They basically confirmed what I said before - that the benefits of 4K totally disappear at about 10-1/2 feet on an 80" screen. At less than that, the resolution increase becomes more apparent the closer you get. It is maximized at about 5-1/2 feet where a normal set of 20-20 eyes can just see all the detail that is there.
You can read Al Griffin's review here: http://www.soundandvisionmag.com/article/hands-sony-xbr-84x900-ultra-hd-tv
They state: "With an 84-inch screen, an ideal viewing distance that would allow you to take in 4K’s added detail is 5-6 feet. But if you’ve spent time sitting 5-6 feet from an 84-inch screen, as I did during my evaluation of the 84X900, you’d probably consider it to be uncomfortably close. Most viewers sit 8-10 feet from their TVs. But a problem with this scenario is that, when viewed from an 8-10 -foot distance, the resolution boost provided by 4K on an 84-inch screen theoretically evaporates. And that was pretty much my experience with the 84X900. In the demo’s native 4K/1080p clip comparison using the two Sony TVs, the native 4K display’s extra detail could be clearly seen at a 5-6 foot (or closer) distance. But when I backed up a few steps — to around 8 feet — the differences faded. It wasn’t that the native 4K picture didn’t look great; it’s just that it no longer displayed clearly better detail than what I was seeing on the other set."
Some years ago when I was experimenting with one of my first of 11 LCD sets I estimated ideal viewing distance for me based on viewing maximum clarity. I was pleased to come across an article with chart a few years later that corroborated my estimates. Here is the visual acuity chart which gives ideal viewing distances based on screen size and resolution. Since I bought my first big set - Pioneer Elite 58" in 1999 I have not changed my opinion on this matter. This also includes 2 projectors (Epson 1080UB and a Sanyo 720P)
If you say that the increase in resolution is obvious at 10 to 14 feet then you are not comparing apples with apples or you have eye sight far superior to the average person. I would suggest an excellent digital source like a Pixar animated movie.
Although I haven't yet had the opportunity to scrutinize the 4K sets, I have been a video enthusiast for many many years and I do trust my eyes, which happen to be 20-20 after laser surgery some years ago.
I have compared 720P sets with 1080P and can confirm that you need to be about 50% further back than ideal for 1080 sets at which distance you cannot tell the difference on similar sized sets.
I do wish the new 4K sets would provide a similar WOW factor that I experienced when HD sets first landed many years ago but the facts just do not support it - unless you sit really close to these big sets.