Why are there no short throw DLP's ?

Discussion in 'Projectors, Screens & Video Processors' started by Tempest, Mar 4, 2005.

  1. Tempest

    Tempest
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    OK....

    Perhaps a bit harsh, as there are shortish throw DLP's

    What I really mean is, why does it seem that popular LCD projectors seem to offer shorted throw than popular DLP models ?

    I'd quite like to try a DLP, one of the popular ones talked about on here, but whenever I go to the projector central calculator I find I'll be loosing a 12" to 18" on the width of my screen I have at the moment.

    So, unless I want to replace my 7ft wide screen with a 5 1/2ft or 6ft screen, I'm stuck with LCD

    Seems odd than DLP makers don't seem to offer the same throw sizes as the BIG name LCD models.
     
  2. martian1

    martian1
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    I had this problem but found the infocus 7200, i now have this and it's excellent! I decided to skip a couple of generations get this cheap and in 2 or 3 years a significant improvement in dlp would possibly encourage an upgrade. The dlp hd2+ etc isn't worth the the extra £1000+ if you have ever tried upgrading a pc with a bit more memory or a slightly faster processor you will understand what i mean, something like 3 chippers would be a major jump though.
    I have set projector an a table about 10ft from screen and can achieve a 84" image no problem :D
     
  3. digisocialist

    digisocialist
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    To be honest do you really want an super sized image from a short distance anyway? I find my 5ft image from 9ft away is more than adequate. In fact, any bigger would be too much. I'm already close enough to just about see the mirror squares in the image...any larger and I think I would loose something.
     
  4. Bristol Pete

    Bristol Pete
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    The Sharp Z91e, the Z201e and the cracking new ZV2000 are all short throw mate.

    Cap :)
     
  5. Joe Fernand

    Joe Fernand
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    Tempest

    What throw distance are you working with?

    Best regards

    Joe
     
  6. Tempest

    Tempest
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    I fully accept that (In many peoples eyes) my image is too big.
    I just could not resist an extra foot wide screen for free, even if it meant a little more screen door.
    And to be honest, even with my low res AE200 LCD Screen door is not enough of an issue to spoil a movie, and going up a res (which my next projector would be) would get rid of it totally for me.

    I'd just like to stick with my 7ft wide screen.

    The room size (projector wall to screen wall) is 11ft.

    So, my throw distance is basically 11ft Minus the distance from the rear wall to the front of the projector.

    I sit against the back wall, so eye to screen distance is about 10ft.

    So we are saying 7ft wide screen from 10ft distance (from my eye!)

    That's 1 - 1.44 screen/viewing distance. A little closer that perhaps some may say, but I think it's ok.
     
  7. Tempest

    Tempest
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    Could you measure (more precise) those figures you gave.

    Projector Central is saying that a Infocus 7200 from 10ft would give a 81" wide screen at maximum zoom.

    Perhaps their calculator is not that exact.
     
  8. seanm

    seanm
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  9. Tempest

    Tempest
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    Thanks, that agrees that at 10ft you will get 80.5" maximum screen width.

    That is very near my 7ft (84" width)

    Question - How near the rear wall can these be placed?
     
  10. seanm

    seanm
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    Give it a couple of inches for the cables.

    But I am pretty sure the fans and vents are on the sides, so no air is taken from the back.

    Second opinion may be needed.
     
  11. GrahamMG

    GrahamMG
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    Ref throw on LCD vs DLP, it is said that as LCD graduated from the business meeting room table (i.e. close to the screen or more likely white board) the very short throw lenses are/were retained, DLP's were developed more for video/DVD display, rather than the LCD powerpoint presentation type thing so ended up with longer throw lenses as they could be made of decent quality without too much cost implication. Do not underestimate the difference a high quality lens can make , the optical path is often the only real difference in these things that have the same basic DMD engine (I'll leave signal processing out of this as that is a whole subject in itself).
     
  12. Mr Grumpy

    Mr Grumpy
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    I feel that a 7200 Screenplay will be perfect given the measurements you are working with. I was initially going to get a 5700 but when the installer put it in situ we found that (somewhat frustratingly) the maximum image was around an inch too small on both sides. It was then that we decided to look at the specs for the 7200 (I already knew it was going for a bargain price) and in doing so we found that it would be perfect for our requirements. Hope that helps in making your mind up. Now you'll just have to hope that there are some still left as they weren't hanging around at the heavily reduced price (£2200 ish).
     
  13. Tempest

    Tempest
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    You have not actually said if you have a 7200 machine.............

    Have you ?
     
  14. Mr Grumpy

    Mr Grumpy
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    Sorry, yes i do have a 7200 (if it wasn't made clear). Must get my signature changed to a larger font size... :)
     
  15. SimonInd

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    The BenQ PE8700+ is a HD2+ machine with a nice short throw that can be had for less than £2500. Mine's about 12 feet back from an 8ft wide screen so I think it'll fill your 7ft one - I replaced my AE100 with it and didn't need to change the projection distance.

    As to why you want a screen that large? surely because you can :D

    Simon
     
  16. seanm

    seanm
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    Hi SimonInd.
    How noisy is the Benq?
    <32db its listed as.
     
  17. SimonInd

    SimonInd
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    It's no noisier than the AE100 was, a friend of mine says it's quieter than his Sony HS20. The newer LCDs are certainly quieter, as is the Optoma range, however the InFocus range are supposed to be similar in noise output. I sit about 5ft, directly, below it and the noise isn't a problem when watching films or TV. When it gets really hot, I had the room at nearly 30 degrees when I was ill, the fan can go up a notch to keep it cool but I've only had that happen the once.

    I've heard the internal scaler is pants but I use a HTPC so it doesn't affect me. On the plus side BenQ's customer service is supposed to be excellent, although I've not had to use it...

    Simon
     
  18. inzaman

    inzaman
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    Well said that man :D
     
  19. jhjerpe

    jhjerpe
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    You can add a short throw lens to the Theme Scene H57, that might be worth checking out.
     
  20. Tempest

    Tempest
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    Cheers, yes, I did spot this.
    It does add another £250 which is quite a bit really (for some!) but it's a bit TOO much if I wanted to do it. I mean it's a bit too much the other way then!

    I'd be interested to hear if this short throw lens affects the geometry badly.
    Also if it just clips onto the lens that is already there or replaces something.
     
  21. jhjerpe

    jhjerpe
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    I will soon be selling a short throw lens for the H57 so it will be going cheap ;), as I am getting a smaller screen. The main reason is a prefernce for a slightly smaller screen as I sit quite close, but to be honest the secondary reason is it does cause slight issues with geometry and focus unless you can have the project dead level, which I can't have.

    I have to agree with the orginal question, it does seem that DLPs generally suffer in this area.

    BTW The lens simply screws onto the front of the PJ.
     
  22. MikeK

    MikeK
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    Tempest

    The NEC HT510 would do 84" screen width from a 115" to 136" throw distance.
    It's a 1024x576 DLP - c£1200 or so.
    It also has vertical lens shift too, which might be handy if you are constrained on mount position.
    I've never seen one in action though, so can't offer anything useful on real world performance.
     

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