Comments on: Lechner Distance: The Number You Need to Know Before Buying an HDTV

By: Steven Conner

Steven Conner — Sun, 13 Dec 2009 15:56:12 +0000

In college, second Art class–major is CIS; however, wanted to add this, which is neat: Pointillism in art, by Seurat, painted dot by dot, to show that visual capacity is truly an illusion–this he was trying to force the viewers optics to “create” the color rather than the painting, thus the painter–to create the color for the viewer–the problem to be discoverd is that his pointiism art is only viewable at certain distances, beyond six feet (I think), his art becomes blurred and the colors turn to brown hues.

–this is where optical colors come into play, such as bluegreen or is it red/green as a primary color since if one stares at primary charted/segmented color then looks away at a white sheet their eyes “create” the primary/secondary color automatically from the previous color. Neat huh?

–now if we had the optics of the sea http://www.livescience.com/technology/091025-mantis-shrimp-eyes.html

–this could explain why colors/objects bend before our eyes, columns from far away (entasis), or similiar illusions–like staring at a chair leg through a chairs enclosed arm–the leg becomes distorted in the optics–probably new color is happening here and our eyes cannot handle it(refraction of light too), so the consequence is bluring.

So in essence, feet and distance to matter espeically if one wants to spend bundles on networking and video elements–understanding the aggregate is essential.

By: Nick

Nick — Sat, 05 Sep 2009 21:04:16 +0000

So if I have 20/14 vision I could sit further away than the recommendations, right? Also, the average person actually has vision superior to 20/16, so most people could sit further away (or use a smaller screen)

(For those who don’t know, 20/16 is better than 20/20 for seeing at a distance)

By: Mort

Mort — Mon, 08 Jun 2009 00:52:32 +0000

I think someone wanted some equations… well, here they are:
I – screen diagonal in inches
D – optimum viewing distance, also in inches

for 16:9, 1080i/p:
D = 1.568 * I

for 16:9, 720p:
D = 2.352 * I

By: Pomber

Pomber — Sat, 06 Jun 2009 17:49:47 +0000

Check this link: http://en.wikipedia.org/wiki/SI

By: Mike Liveright

Mike Liveright — Sat, 06 Jun 2009 03:42:47 +0000

I’d like an equation, or set of equations, that is derived. that says something like:

1080 set “I” inches, sit “F” feet,

~ F = I/7.6 (1080)

720 screen I” inches sit “F” feed,

~ F = I/5.1 (720)

16*9 screen

~ Width = 87%*I, (16*9 diag)

4×3 screen

~ Width = 80%*I (4*3 diag)

16*9 high definition screen diagonal “HD” whose picture is the same height as 4*3 standard definition’s screen’s diagonal “SD”,

~ HD = 122%*SD

==============================

By: Kerry

Kerry — Sun, 04 Jan 2009 04:03:29 +0000

I’m sitting at somewhere in the neighborhood of 12 feet or 144 inches. I’m looking at the Sharp LC-52D64U. Do you think it would work?

By: Bob

Bob — Mon, 01 Dec 2008 14:29:33 +0000

Guru,

I am purchasing an HDTV for our bedroom and will watch lots of sports. We are 140″ from the tv when in bed. Our space will not accomodate larger than a 40″. What is your recommendation on screen size and pixel resolution?

By: Jeff Paul

Jeff Paul — Fri, 17 Oct 2008 04:11:33 +0000

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By: Bob Stone

Bob Stone — Fri, 22 Aug 2008 13:45:37 +0000

I’ll confess to being confused regarding HDTV formats. I remember in an earlier HD GURU Basics article that there were just two high definition formats – 720p and 1080i. I was surprised to read in this discussion that a 1080p format exists and my HDTV tuner can receive it.

This whole issue cries out for more clarity. I wonder if the HDGURU would publish a chart showing all the formats as they exist on paper, what formats are currently in use and by who (be it — broadcast TV, cable, satellite, or Blueray disc).

By: Terry

Terry — Mon, 14 Jul 2008 16:29:04 +0000

What viewing distance is the minimum for viewing 3d movies on my tv that is 3d ready. I have the media to support this technology.