Unsure about screen/projector heights.

Discussion in 'Displays' started by Robert McLay, Dec 13, 2004.

  1. Robert McLay

    Robert McLay Stunt Coordinator

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    I am trying to put down on paper how I believe my HT will be, but I am coming up with a few problems.

    #1: How far up should the screen be from the floor - I do plan on having a second row if this makes a difference. Plus a stage.

    #2: I am going to be ceiling mounting the projector, not sure which one yet, but I don't know where to put it in relation to the screen. I downloaded a few manuals and it looks like they keep putting it in the center of the screen. This doesn't seem very feasable to me, because that would put the projector in the middle of the room vertically - right in the view of the person sitting.

    I know there are quite a few of you with projectors, Neil, Chris, LaMarcus (Now) who could answer my questions.

    Thanks guys in advance.

    Rob
     
  2. Bob_Chase

    Bob_Chase Stunt Coordinator

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    Bob,

    My PJ is set up as a table-top and the instructions recommended that the bottom of the lens align with the bottom of the screen. In your case, since it'll be a ceiling mount, you'd flip it (top of the lens to top of screen.)

    Not sure if make and model of projector have any bearing on the setup.
     
  3. JasG

    JasG Auditioning

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    General recommendations are that the screen should be positioned vertically so that eye level is one third up from the bottom of the screen.

    When ceiling mounted, each projector has an 'offset' value, often expressed as percent of screen height above the bottom of the screen to the center of the lens. Sometimes the manufacturer of the PJ provides a table, formula or calculator. (If not, you can figure it out pretty easily)

    Here is an example :

    Screen : 45h x 80w
    Eye level : 45
    PJ offset : 110%

    - Mount screen 30 inches from the floor.
    - Top of screen is 75 inches from floor (30 + 45)
    - PJ is 79.5 inches from floor (30 + 45 + (45*1.10 - 45))
     
  4. Robert McLay

    Robert McLay Stunt Coordinator

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    Thanks for the respones guys.

    JasG, I thought there was something with an offset, but I couldn't find anything in the manuals of the few I looked at online. Well I appreciate the answers.

    If anyone else has any other info, feel free to chime in.

    Rob
     
  5. JasG

    JasG Auditioning

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    ... forgot to mention that some projectors have adjustable offsets, in which case, you have a lot more flexibility.

    This makes installation much more convenient, but lack of adjustment generally only means that you must be more careful when planning the installation. Adjustable offset is a bit rare in all but the most expensive DLP projectors.
     

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