Problem with projected screen

Discussion in 'Projectors, Screens & Video Processors' started by obiwan, Dec 23, 2002.

  1. obiwan

    obiwan
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    The image from the projected picture is uneven.

    In any aspect ratio, the bottom line from the picture is perfectly horizontal. I can set the bottom of the image with bottom of the screen. (New Walter Stewart 80x45" 16:9)

    The problem is with the top of the image. When the bottom is horizontal there is a distinct "tapering effect" on the top of the image. From right to left the picture is approx 2cm smaller and noticably falls to the left.

    I can adjust the picture to fill the screen ok to avoid this "taper" appearing on the main screen, but then the picture is projected up onto the top black bar on the screen.

    Im unsure if this is a normal trait of PJ's or wether it needs help.
    The PQ is fine and I see no DP.

    :confused:
     
  2. JonMace

    JonMace
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    sounds like your PJ is not sqare to the screen
     
  3. obiwan

    obiwan
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    The PJ is sitting square, directly in front, mounted on small table for the moment. It is going to be ceiling mounted soon.

    But that is exactly what it is like though, the image seems not to be projected square.

    It is the panny ae100, going through a prov.

    I never noticed before, but I only just got the 7ft screen.

    merry xmas
     
  4. Dodgey

    Dodgey
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    Your symptoms are 100% due to the PJ not being square. It may seem square to you, but try gently raising the front (or rear, can't get my head round which right now!) of the PJ and watch the picture go square.

    Mine is a tad off, but I over-project onto the screen's black borders so it matter not....
     
  5. Hex

    Hex
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    adjust the keystone correction mate!?
     
  6. obiwan

    obiwan
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    I never appreciated how much the picture could be thrown out of alignment with such a very small amount of re-adjustment.

    All OK now, thx ppl.
     
  7. Beamer

    Beamer
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    Looks like your lense is not positioned to be centre of the screen and or not square with the screen as mentioned by Dodgey. Set your keystone correction to zero and mount the PJ temporarily in the perfect position. This will confirm your PJ optics are OK

    Use a tape measure to set the lense position, your eyes are simply not good enough.
     
  8. Dodgey

    Dodgey
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    Glad you are sorted Obiwan. Electronic Keystone adjustment is best avoided.

    Have a good Xmas
     

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