Viewing cone angle for screens with gain?

Discussion in 'Projectors, Screens & Video Processors' started by Tempest, Mar 11, 2005.

  1. Tempest

    Tempest
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    If you wish to buy a screen with a little gain (1.something)

    Do they actually tell you the viewing cone angle (if that's the right term)

    The angle of reflection of the light bouncing off the gain'ed screen and back to your eyes.

    A matt screen I guess has an incredibly wide viwing cone so the image looks the same for almost any angle.
    Something with a very narrow cone would have a bright spot (hot spotting)

    Just wondering, so you can do a calculation to work out how much gain you can have before getting into any problems

    (LCD Projector)
     
  2. Tempest

    Tempest
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    Just wondering, did I explain my above posting badly?
    Should I draw some images to explain what I mean?

    It's basically, how much gain can I go for, so that from a central seated position I don't get any hot spots from any point on the screen?
     
  3. foghorn

    foghorn
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    Tempest,

    The higher the gain the narrower the viewing angle, the lower gain screens such as matt white or grey (high contrast) will give you a wide viewing angle.

    Beware of high gain screens such as glass beaded the are not designed for ceiling mounting this is because the light is bounced straight back to the projector, for example if you stand up the image is bright when you start to sit down the image begins to dull down.

    Foghorn
     
  4. Tempest

    Tempest
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    Cheers yes, I understand what you are saying which is why I put up my original posting.... :)

    If there is a ANGLE on the viewing cone which goes with the gain of the screen, that way you can calculate the gain you can have before the viewing cone becomes too narrow to cause any problems

    But no-one seems to know
     
  5. David_of_Surrey

    David_of_Surrey
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