# How far to sit from different size TVs?

Discussion in 'Archived Threads 2001-2004' started by Rob Dawn, Jul 16, 2001.

1. ### Rob Dawn Stunt Coordinator

Joined:
May 8, 2001
Messages:
117
0
Trophy Points:
10
I seem to recall reading something on some Web page many moons ago regarding the optimal distance you should sit from TVs. But I of course have forgotten both the page and the distances.
Does anyone know of some recommended distances you should sit away from the TV based on it's diagonal size? (I'm guessing 4x3 Direct View and 16x9 RPTV values would be different as well.)
Rob

2. ### Gerard Martin Second Unit

Joined:
May 22, 2000
Messages:
366
0
Trophy Points:
0
Try screen size divided by 3.5
------------------
Jerry

3. ### Ray Tseng Auditioning

Joined:
May 10, 1999
Messages:
5
0
Trophy Points:
0
At least twice the vertical height of the screen. Usually more.
[Edited last by Ray Tseng on July 16, 2001 at 06:20 PM]

4. ### Kevin C Brown Producer

Joined:
Aug 3, 2000
Messages:
5,712
0
Trophy Points:
0
I have heard 2 - 2.5 x times the diagonal picture size.
------------------

5. ### Andrew Beacom Supporting Actor

Joined:
Jan 11, 2001
Messages:
792
0
Trophy Points:
0
The current issue of The Perfect Vision mentions 3 times the height for HiDef and 7.2 for the rest.
I normally work with 3 times the height. If you are unsure check out a TV at a store with normal cable and try different distances. You want as close as possible without seeing scan lines.

6. ### JohnHN Stunt Coordinator

Joined:
Dec 20, 2000
Messages:
91
0
Trophy Points:
0
There are two sorts of distance rules. The resolution rules are based on screen height and display resolution. The impact rules are based on screen width. To convert either to rules based on the diagonal, break out the old Pythagorean theorem.
On resolution, the basic benchmark is the critical viewing distance (CVD). Sit further away than the CVD and you lose resolution. Sit closer than the CVD and you start to see structure (this includes more than just scan lines; sit too close and images that should look smooth look blotchy). But you can usually sit MUCH closer than the CVD, gaining impact, before the structure becomes annoying. For example, the CVD for standard interlaced video is 7.2 times screen height (as was mentioned above), but with progressive DVD I find 4 just fine. Many argue for a smaller multiplier. Some prefer a larger multiplier. It is a matter of personal taste.
A discussion of both sorts of distance rules, written by Greg Rogers, can be found at
http://www.theperfectvision.com/howto/howto_tech_4.htm
------------------
[Edited last by JohnHN on July 17, 2001 at 07:24 AM]

7. ### Jay Mitchosky Producer

Joined:
Sep 6, 1998
Messages:
3,729
0
Trophy Points:
0
I've always used three (3) to five (5) times screen heigh. Although every time I've viewed at 3x it's always seemed too close. Personally I find 4-5 ideal. If you're talking interlaced sets the ultimate goal is to not see any scan lines. With a progressive set the rules change in that there aren't scan lines, but you'll still find that when you're too close the image suffers.
I'm moving this to the TV Forum. If you search under this topic you should find a number of previous discussions.
------------------
--Jay
"No one can hear when you're screaming in digital."
My Home Theatre Pictures...
"You're no mesiah. You're, you're a movie of the week. You're a ... t-shirt, at best."

Joined:
Jan 20, 2001
Messages:
21