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height to project a picture at?

Discussion in 'Projectors, Screens & Video Processors' started by micks_address, Jun 9, 2003.

  1. micks_address

    micks_address
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    Hi folks

    Just wondering what people opinions are on what height a picture should be at if i'm viewing it from a seatiing position. Where's the ideal eye level position for the picture?

    Cheers,
    Mick
     
  2. nathan_silly

    nathan_silly
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    Middle of the screen.
     
  3. Kramer

    Kramer
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    Eye level 1/3rd up from the bottom of the screen.

    Any advance on 1/3rd :D
     
  4. theritz

    theritz
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    Well, I'd say a third too... optimium recommended by SMPTE, Kramer, afaik.

    If you're concerned to obtain the optimum viewing arrrangement, and you're in the humour to do the math, the formula for the vertical subtended visual angle, which is the determinant of how much of the vertical field of vision (V) of a viewer is occupied by a screen of a given height (H) a fixed distance (D) from the viewer is as follows:

    V = 2xtan-1(H + D)

    The optimum vertical is 15 degrees.

    The Horizontal subtended angle (for the horizontal field of vision) is found by the following formula where W is the width of the screen and D, as before, is the height......

    2xtan-1(1/2 W / D)


    Have fun !!



    Sean G.

    The optimum horizontal is 30 degrees.
     
  5. theritz

    theritz
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    Forgot to mention in the above that the optimum horizontal viewing angle would normall place you too near the screen for LCD type projectors - recommended seating distance is between 1.5 and 2xscreen width, in order to avoid seeing secreendoor...... factor that into your consideration of setting up.....


    Sean G.
     
  6. theritz

    theritz
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    You can also check out the viewing distance calculator here, it does the calculations mentioned above for you, as well as making recommendations as to SMPTE and THX standards.

    If you want further detailed setup data, you should download Michael Grant's Super Duper Screen Viewing Angles Computer from here - you'll need to unzip it - it's an Excel Spreadsheet, and a cool piece of work.

    All the best,

    Sean G.


    Note to Mods: Three separate posts, no intention to "pad", the info is rather a lot to gather in one go !!!
     
  7. LV426

    LV426
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    Too sweeping a generalisation. Visiblity of screendoor varies from PJ to PJ. A high resolution PJ (like the Sony VW12) has a finer matrix than that of, say a Panny 100. So, you can view a larger image without being distracted by the pixel structure.
     

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