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College Projector

Discussion in 'Projectors, Screens & Video Processors' started by Tom Tom, Nov 2, 2004.

  1. Tom Tom

    Tom Tom
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    OK I have a problem and if you can help please.

    I work in a 6th form College and in Media and Film they had projectors for showing films. It was a way back from the screen and gave a nice big picture.

    Over the summer they installed interactive white boards and moved the projectors closer to the screen.

    This meant that the throw was decreased and the picture became smaller for the films.

    I need to have a recomendation of a good projector that will work for the White boards but has an adjustable throw so they can zoom out to make a big picture but still have the projector close to the screen

    The projector at the mo is a Hitachi CP-X275 (the oldest and 2 others which are newer models)

    Any help please.
     
  2. Chris Frost

    Chris Frost
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    This should probably be posted in the LCD forum...

    and I would also mention that you are talking to a bunch of home theater enthusiasts, so their recommendations will be biased towards the products they know best - home cinema projectors - rather than commercial projectors for classroom use.

    Here's a short cut to some important bits of info:

    if you do the research you'll find that most LCD/DLP have a 30% optical zoom. This means that the picture on a 70" whiteboard (56" wide) can be expanded to 91" diagonal - equivalent to 72" wide. This assumes that the projector is installed at the longest throw distance to achieve a 70" picture on the whiteboard, which would then leave the maximum amount of zoom available to enlarge the picture.

    Projectors with very large zoom ratios tend to use long throw lenses. There are two implications here. First, the projector will be mounted at the rear of the room - hardly the most practical solution with whiteboards in classrooms not to mention problems with shadows cast on the image as the teacher writes. Second is cost. Long throw lenses go hand in hand with conference projectors - this means spending £3000+

    The Hitachi CP-X275s cost less than £700 in the education market. It's going to be a lot more cost effective to buy a second projector for the rooms that need video than try to find one projector that meets both roles.

    Talk with your suppliers to get a feel for what's available.

    Regards
     
  3. GagHalfrunt

    GagHalfrunt
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    Moved from CRT Projectors forum
     

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