Rear projection mirror size?

Discussion in 'Beginners, General Questions' started by Energi2er, Aug 24, 2006.

  1. Energi2er

    Energi2er Auditioning

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    I am building a rear projection system for a flight simulator and I have search the forums here and I cant find out how I know what size mirror to get and how far I need to mount it from the screen.

    Do I just get a mirror exactly one half size of the image I want and bounce the image off of the miurror at the half way point of my throw distance?

    seems like that would work with any projector just different projectors would give me different throw distances.
     
  2. drobbins

    drobbins Screenwriter

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    Dave
    Are you using a mirror to cut throw distance, or reverse the image?
    My 4805 has a setting to reverse the image for rear projection. I would imagine most other projectors do.
    If you are trying to cut down on the throw distance, I would think any mirror would work. The mirror size would be proportional to its location. The closer to the projector, the smaller it could be. The closer to the screen it is mounted, the bigger.
    Dave
     
  3. Energi2er

    Energi2er Auditioning

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    Im using a front surface mirror to do both fold the throw distance and reverse the image. in a rear projection system the image is reversed from a front projected image, then projected to the back of the screen. when viewed from the other side of the screen (the front) the image gets flipped back around.
     
  4. drobbins

    drobbins Screenwriter

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    The 1/2 way point will give you the shortest "folded" distance. The image should be about 1/2 size at that point. I don't think it would matter if the size of the mirror is bigger then needed at that point. Once set up, you could mask off the unused area if it caused problems.
    Dave
     

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