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Infocus ScreenPlay 4805 article/review

Discussion in 'Projectors, Screens & Video Processors' started by Oakleyspatz, Nov 29, 2004.

  1. Oakleyspatz

    Oakleyspatz
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  2. digisocialist

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    It is a good review and the 4805 has been at the top of my list for months - the price for what it produces is phenominal in my view; I've demo'd it twice now and think the picture is truly amazing.

    I am concerned regarding the vertical offset which requires it to be mounted below the screen by 27.3% of it's height which may be a problem in a room with a low ceiling. I will have to ceiling mount and my ceiling is only at 6.7ft heigh from the floor. From the the ceiling I only have 52" of available drop on which to project from a distance of 9.5ft which would give me a maximum screen size of 36"Hx64"W - by my rather sketchy maths I think this is saying then that if I ceiling mounted the 4805 the projected image would be positioned 27.3% of the 36" image size from the ceiling, which roughly works out at 9.82" or 42.72" up from the bottom of the wall area to where the top of the image will be and 42.72"-36" = 6.72" of available space below the projected image. It's a tight squeeze but fits.... let's hope that the screen calculator is accurate!
     
  3. inzaman

    inzaman
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    When i viewed the 4805 i was very impressed, so much so that i was going to get one and sell my Z2. But knowing the room that it would eventually go into the throw and offset did make it a bit of a no go, unfortunately.
     
  4. digisocialist

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    Inzaman - I'm glad you replied to this because my room is a very similar size to yours. In fact the ceiling height in my room is only 4" heigher than yours (Yours 6'3", Mine 6'7") and the floor space is also very similar. The reason I have to mount leaving me with only a throw distance of 9'5" is due to a stairwell causing me to have to mount a considerable way in from the back wall :mad:

    I'd like to hear your thoughts on my situation in regard to the 4805. The maths appear to equate unless there is something I am not taking account of which I should. I'm pretty set on DLP and the 4805 whilst not offering everything I want, does give me the best for the price. I'm even going into WAT (Wife Acceptance Test) next week when I have a 2hr demo booked in for her to come and see it (along with the 2805, 1910 and a set of Castles :devil: )

    I wrote to Optoma yesterday to seek information on their H57 model and in particular whether if ceiling mounted there would be a vertical offset with such a margin on this model. I've yet to get a reply but if through this I discover the 4805 is not going to be practical, then I will have no option but to up my budget to the H57 (unless someone can seriously convince me that there is an LCD on the market with as good a PQ as the 4805 i.e. without any VB, SD etc)

    Any thoughts welcomed :)
     
  5. Sigismund

    Sigismund
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    Cine4Home have reviewed the 4805 in some depth also :)
     
  6. Bogeyed

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    Digisocialist- I also emailed Optoma for the answer to the image offset ratio, as yet still awaiting a reply, but I do remember reading somewhere that on the H57 it is about 33% or therabouts -certainly greater than the 4805, which might make the situation worst for those with low ceilings. I'm off for a demo of the H57 tomorrow so I will find out.
     
  7. digisocialist

    digisocialist
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    Bogeyed - Keep me posted. It would be more problematic if than is the case with the H57 as the screen size you get from the same throw distance is actually bigger that the one you get from the 4805. The H57 would give me a 41" heigh screen and if at 33% Vertical Offset, I equate this to a distance of 13.53" from the ceiling - I only have 52" available so the screen would either drop below the available wall space or I would have to reduce the image to 38" heigh maximum :(...

    I can't be the only person in this situation surely... has anyone managed to squeeze a DLP PJ into a room of my dimensions and ceiling mount it?
     
  8. rickyd

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    What a bummer, i was just about to order a 4805 and then i read all this :confused: Having three young kids i have no choice but to ceiling mount,
    cant it be adjusted through keystone? surely someone must have fitted one of these to a low(7ft) ceiling about 13ft from the screen :lease:
    kinza
     
  9. digisocialist

    digisocialist
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    I'm going to further complicate matters now. There are of course 2 ways of ceiling mounting a PJ. One is to mount it upside down on a ceiling bracket and the other is to custom build a ceiling box which it can sit in and therefore be the 'right' way up. Does the latter alter the margin by which the vertical offset is to be accounted for? Or rather, is the former the position to which the margin in the afore mentioned review refers to?

    In simple terms... this is doing my head in. :confused:
     
  10. Bogeyed

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    Digisocialist, have a look at this -http://www.infocus.com/service/sp4805/downloads/ScreenPlay%204805%20calculator%20with%20screen%20brightness.xls

    You can see that it would not be possible to mount this projector right way up near the ceiling because of the image offset ratio (Infocus 4805 in this case) but this worksheet enables you to calculate all the distances required for your room.
     
  11. Bogeyed

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  12. digisocialist

    digisocialist
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    Bogeyed - Thanks. This is now a major concern. Ok, I have re measured. Assuming I can mount the PJ at the furthest point back i.e. there is an available supporting beam, this is 128" from the screen - 13" which is the length of the SP4805 gives me a Maximum throw distance of 115" (about 9.5'). If I calculate the offset at the 'Shortest Throw Distance' it reckons I ca get a 65" wide screen and the distance to ceiling would be 15.16" this gives me a 36.56" heigh screen leaving me 1.28" below the image!!! That is tight! measured at the 'Longest Throw Distance' I'd only get a 54" wide screen but would have 8.18" of available space below the screen!! I don't realy want a 54" screen :(

    Can anyone tell me whether I should be assuming the Longest or Shortest Throw distance? Firthermore, if anyone thinks I'm cutting this a bit too tight?
     
  13. digisocialist

    digisocialist
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    I've worked it out all wrong (because it's late). Was assuming the minimum distance from ceiling reffered to screen and I was looking at the Mounting! Taking that into account gives me even less room! The 4805 now no longer looks viable! I could squeeze in by millimetres a 54" screen size.

    This has turned my world on it's head! Now looks like I'm in the market for an LCD... something I haven't banked on at all until now.

    Does anyone know of a DLP which could be used in my room? If not,
    Can anyone recommend an LCD which is as good as a DLP for about £1500?
     
  14. MikeK

    MikeK
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    You could take a look at the imminent NEC HT510, a new DLP model. I believe they are shipping mid December.

    It's around the same price (£1300) but offers 1024x576 resolution (as opposed to the 4805s 854x480), and, conveniently for you, a vertical lens shift system.
    A quick calculation (you'd have to check it yourself of course) means the 510's relatively short throw, would give you a 16:9 screen between 82" and 98" diagonal, when mounted 115" back. If that's too big, you'd always have the option of mounting further into the room. 100" would give you between 72" to 85" diagonal

    They are also doing the HT410 (around £900) - same as the 510 except for the res - it's 854x480 - the same as the 4805. This does affect the throw though, so the 16:9 screen size, assuming the same 115" mounting distance, looks to be between 68"-80".


    PS
    The screen sizes are from their published throw ratios of
    HT510 - 1.35 to 1.61
    HT410 - 1.65 to 1.96

    The projection angles, using the lens shift system, are
    WIDE 5.5 to TELE 6.5 degrees (minimum)
    WIDE 13.5 to TELE 16 degrees (maximum)
    The angle is between lens centre to screen centre


    PPS
    With a 480p projector, you probably don't want to be viewing at much less than 2x the screen width - you may start to see pixellation. Obviously, a 576p projector would allow you to go a little closer, say 1.7x.
    Mileage varies with this for different people, but these are ballpark min viewing distances - personally I'd probably back off a bit further.
     
  15. Bogeyed

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    Now that does look interesting-lens shift has to be a feature that makes installation so much simpler,and for a reasonable price. Well I'm off to demo the H57 but I will bear the NEC model in mind before commiting the cash.
     
  16. MikeK

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  17. inzaman

    inzaman
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    Digisocialist when i did the calculations i think my screen size was going to be about 70inch wide with the 4805 as opposed to 80inch wide with the Z2 and the vertical offset being a problem.

    The Z2 though does fit very well and the lens shift does help no end, so the perceived picture quality improvement i would have got with the 4805 (which i suppose is arguable and was down to my own opinion) would be lost in the smaller screen and the fact that i would actually trip over the projector even though it would be ceiling mounted :D

    I was really wanting a DLP as my next upgrade (the Sony has somewhat complicated that) but the throw ratios are quite longer than LCD and lens shift is not yet common place, hopefully in the next 12 months this is rectified by the DLP manufacturers.
     
  18. inzaman

    inzaman
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    Also the other DLP that i would have got to fit was the H77 which does have vertical lens shift, but costs £3,500.
     

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