# Screen Size and Effective Viewing Size

Discussion in 'Archived Threads 2001-2004' started by Bryant Trew, Aug 14, 2002.

1. ### Bryant Trew Second Unit

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I think I need some help here. I'm thinking about replacing my RPTV with DLP (or adding it). Well, in the case of adding a screen and placing it on my wall, the viewing distance will be three feet greater than it is now.

So at an initial distance of 10 feet, My 58" RPTV gives me a screen to distance ratio of 0.483 (58" divided by 120"). If I moved up to a 100" screen, but mounted it on the wall three feet behind, I get a screen to distance ratio of 0.641 (100" divided by 156").

I'm not sure if my mathematics is correct in figuring this out, but I think this means that the perceived increase in screen size will be 32.6% (0.641-0.483/0.483). This is in contrast to if my 100" screen was placed at the same distance as my RPTV (100-58/58 = 72.4% increase).

Does this math make sense to you? Would I effectively be increasing my sceen size by 32.6%?

2. ### Adam O Stunt Coordinator

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Heres a site I found a while ago, apparently u would increase your picture size by about 200%, this does not take into consideration their perceived size based on the viewing distance. Hope this helps somewhat,
http://www.cavecreations.com/tv2.cgi

3. ### Bryant Trew Second Unit

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Ahhh, that's right. Mathematically it's exponential, not linear. Thanks!

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