Sort of OT: Turn your TV into a 150" projection TV?

Discussion in 'Amateur Video Production' started by Web Master, Aug 3, 2003.

  1. Web Master

    Web Master Guest

    I'm thinking about getting one of these. Does it really work as well as they
    say? Is the competition better? I think it's a hoax. I'd love to see an
    honest opinion of this thing before I send my money.

    http://www.maxtheater.com/
     
    Web Master, Aug 3, 2003
    #1
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  2. Web Master

    Rick Diamond Guest

    You either work for these theives or you're incredibly naive. Oh...and Mr.
    Web Master, what's you're real name?

    Rick Diamond
     
    Rick Diamond, Aug 3, 2003
    #2
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  3. Web Master

    David McCall Guest

    I would put it more in the catagory of a hype than a hoax. This kind of
    has been available for several decades, and I'll bet it works, but they
    are hoping you aren't paying good attention. You are buying a pair of
    lenses, and some plans to build a plywood box to put them in. Plus,
    you may have to go into the set and swap around some wires to flip
    the scan, but they were vague about that on their page. There is the
    line: "Using our "fix" you do not have to turn your TV upside down"

    You don't get the nice rear projection screen and box like the one
    shown on the home page, you will be building a plywood box
    as shown on http://www.maxtheater.com/details/

    It probably works, but it likely needs a very dark room, and likely
    doesn't look great, just big.

    David
     
    David McCall, Aug 3, 2003
    #3
  4. Web Master

    Web Master Guest

    Neither. In fact, I'm assuming that it's a hoax, until I see a positive
    review by a well known company/person.
     
    Web Master, Aug 3, 2003
    #4
  5. Web Master

    David McCall Guest

    I don't see what clues you into it being a hoax. It is a
    bit of a kludge though. I didn't study the site very closely,
    but nothing seemed blatantly off base. It was written,
    and illustrated (the picture of rear projection set), in hopes
    that you would think it is much more than it really is,
    but they leave it to you to come to that conclusion.

    All I saw them promise is 2 big lenses and some instructions
    for putting it all together. It isn't a hoax unless they aren't
    delivering what they promised. They don't claim that it is just
    as good as a $4000 projector, or anything extraordinary.

    David
     
    David McCall, Aug 4, 2003
    #5
  6. Web Master

    David McCall Guest

    That is exactly what I thought they were selling, after looking at the page.
    They also show you an actual picture of the wooden box YOU have to build.

    Many years ago, I came across one of those flat plastic lenses and tried it
    with a 13" TV (I didn't really build it up, I just hung it in front and masked
    some of the spill). It was pretty clear (you could see the shadow mask from
    the tube really well :), but I'm still glad I didn't pay $25 to try it. My biggest
    objections were that it wasn't very bright (it was only usable in the dark),
    and it was hard to use with a manual tuner TV. (how many of us remember
    manual rotary tuners?). I wanted to be able to watch TV in the daytime.

    There was a bar in Boston that had pretty much the same thing hanging
    from the ceiling (it was commercially built with a plastic housing and a
    remote control TV), and it worked as well as could be hoped for. The worst
    was that it wasn't very bright, and even the dim lights of the bar easily
    washed it out. There were poorly adjusted Novabeams that looked even worse.

    I do agree that it is misleading with that imaginary rear projection unit
    decorating the page, but they never promise that you get one of these.
    In fact they make it pretty clear what they are selling. The screen shots
    look suspiciously good, but they are making pretty good plastic lenses
    these days. In fact, if the screen shots are real, those lenses might be
    well worth $12 each.

    Most people would be disappointed when they realized how much work
    was required, for so little gain. There is a lot of marketing speak on the
    page that might mislead some people.

    I remember when color TV was just starting there was a product that turned
    your black and white TV into a color TV. It was a piece of plastic that you
    would stick to your old black and white TV. It was blue at the top to render
    the skies blue, it was sort of orange in the middle for the flesh tones, and at
    the bottom it was green to color the football field. It's crazy, but some people
    bought them anyway, even though the print ads for the product clearly show
    what the result would be (on a carefully chosen shot). That was closer to
    being a true hoax.

    David
     
    David McCall, Aug 4, 2003
    #6
  7. Web Master

    John Nichols Guest

    David,

    I definitely remember those plastic sheets for the TV.
    Our neighbor had one, and we went over to his house to watch it.
    Cookie's car was two-tone green and orange.
    So was Palladin's horse.

    Also; that gives me a definite clue as to your age (and mine).


    John nichols
     
    John Nichols, Aug 5, 2003
    #7
  8. Web Master

    Web Master Guest

    The room I plan to use it in can be made completely dark. If it gives a so
    so image, I'll be happy. I doubt I can get even that....

    If the thing worked at all, there would be premade versions of it in nearly
    every TV store.
     
    Web Master, Aug 5, 2003
    #8
  9. So far, no one in this thread has mentioned that, according to the
    site, the lenses provided with this kit are plastic Fresnel lenses.
    That is pretty much a guarantee of very poor optical quality.

    1. The rings that are part of the design of a Fresnel lens will cause a
    good deal of blurriness because of diffraction effects.

    2. The lenses are single elements (note that the kit consists of a lens
    and a spare, not a two element lens), so that various optical
    aberrations can NOT be corrected. There is a possibility that spherical
    aberation can be designed out, but chromatic aberration, curvature of
    field, and coma are pretty sure to be uncorrected.

    3. Unless the lenses are molded with unusual precision, they will lose
    sharpness because of random wave-front errors - like looking through a
    cheap pane of glass.

    There is one advantage to this kind of lens: it is possible to make a
    very fast (large f-ratio) lens very cheaply.

    I don't intend to buy a set.

    HTH,
    Gino
     
    Gene E. Bloch, Aug 5, 2003
    #9
  10. Web Master

    GMAN Guest

    Im just the opposite, i cant stand when one insists on having every damn light
    on while i try to watch a movie.
     
    GMAN, Aug 5, 2003
    #10
  11. Web Master

    David McCall Guest

    I like a pretty dark room when I watch a movie too, but this will likely need a
    Very Dark room to be at all usable. While that is OK for serious watching
    (not that you would want to do serious watching with this thing), it is nice to
    be able to still see what is on your TV in the daytime.

    Gene brought up that this was a plastic single element lens. What else could
    one expect at 2 for $25. We have a real video projector (lets just say that it
    cost many times what this pair of lenses cost), and it still wants a pretty dark
    room to have anything like blacks. It is really bright though. I wound up stretching
    a gray sheet to make a screen, just to cut the level down when using it at home.

    David
     
    David McCall, Aug 5, 2003
    #11
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