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7" 7' question

Discussion in 'Projectors, Screens & Video Processors' started by ilkand, Jan 29, 2005.

  1. ilkand

    ilkand
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    I have seen it said that a 7" crt should be used to produce a max. 7' image. Is this 4:3 shape, and is it diagonal or heightwise?
    I want to buy a 2.35:1 screen and keep image height constant. What size should I go for?

    Thanks for any help
    Andy
     
  2. Godfather

    Godfather
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    The 7 foot maximum rule refers to the horizontal width of the image, regardless of 4:3 or 16:9. A 2.35:1 ratio screen is not such a good idea because you'll never be using more than half of the tube face (which is roughly 4:3 in shape), so you'll be losing brightness and causing premature wear of the tubes.
     
  3. ilkand

    ilkand
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    Thanks, I had not realised that. So do you run a 4:3 screen in your place? I've seen the pictures but forgot to look.

    Andy
     
  4. fortean

    fortean
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    I would agree with Godfather. Widescreen (1.78/1) is the best compromise as you loose the least amount of screen for 1.33/1 and 2.35/1 or you could go for a multi-format screen.

    On my Aspect Ratio Calculator page it shows all 3 aspect ratio images across all 3 screen sizes and gives a good idea what you will get.

    http://www.4tn.net/homecinema/aspectratiocalculator.asp
     
  5. Godfather

    Godfather
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    I have a 6.5ft electric 4:3 screen. I watch equal amounts of 4:3 and widescreen so for me it's perfect. For 16:9 or wider I just move the screen up a few inches and mask the top with a black blind.

    http://premium.uploadit.org/henrysyuen/HC-11.04.jpg

    Personally I wouldn't go any wider than 6.5 ft with 7" tubes.
     
  6. ilkand

    ilkand
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  7. Sammy Jankis

    Sammy Jankis
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    I have a Barco 708mm and a 8ft screen. The picture is fantastic. If you want a bigger picture go and get it. I would have had a 9ft screen if I could have fitted it in the room. The projector was professionally installed.
     

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