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urgent question Domino H20

Discussion in 'Projectors, Screens & Video Processors' started by js911, Sep 19, 2005.

  1. js911

    js911
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    I am kitting out a room for projector in conjunction with
    my builder and today we discovered what we will call a
    "small" cock up. He has built a box into the chimney breast
    to house the projector but we assumed he knew that this
    should be centred. It turned out this was not possible as there
    was not a big enough void behind there. Net result off centre
    mounting of the projector ! I don't think this is going to work
    but before we block up the hole and build a shelf I thought
    I'd consult here.

    The projector in question is likely to be a Domino H20. It is a 7"
    screen and we are projecting from 16" way (approx 5.3m). Now
    the centre of the box is 50cm off centre and I think if I mounted
    the projector on the box ceiling I could get the lens to be ~35cm
    off centre. This is about 6degrees or so projection angle.

    Now I believe the H20 has no horizontal keystone correction is
    6degrees tolerable or should I bite the bullet and get it right !
    BTW its not just the hassle of doing this again having the projector
    recessed was a real selling point to the wife !
     
  2. RTFM

    RTFM
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    The Domino 20H has vertical lens shift but not horizontal.
    It has both vertical and horizontal digital keystone correction but this is best avoided as picture quality suffers.

    If you are placing the projector in a void, make sure there is plenty of ventilation to avoid the projector overheating and shortening the lamp life.

    Jeff
     
  3. js911

    js911
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    Yes there's plenty of ventilation - we at least got that bit right !

    How much horizontal offset is tolerable though in your experience - over
    this 18" projection distance ? Clearlly zero is ideal but on the other hand
    I suspect say 1deg i.e. 6cm or so would be completely OK. At what point
    would you start to notice this ?

    Thanks
     
  4. js911

    js911
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    I mean to say 16" projection distance
     
  5. RTFM

    RTFM
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    Even the smallest amount of digital keystone correction degrades the image to some extent. You can get artifacts such as Moire patterning visible on say a Tweed suit or anything that that has a fine line pattern in the image.

    Best to lose any minor geometry problems in the screen black border if you can.

    Jeff
     

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