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Rainbow

Discussion in 'Projectors, Screens & Video Processors' started by zombie_donkey, Nov 21, 2004.

  1. zombie_donkey

    zombie_donkey
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    I mean the DLP rainbow effect.

    I have heard that this affects only a certain type of person (With special brains). I just got an Optoma EZ 737. I only got the thing today and am waiting for a screen to arrive so I have only used it with a white sheet as a screen, the picture is fantastic and I watched Finding Nemo for 20 minutes just to make sure it worked OK and to set it up. I have noticed the odd rainbow effect here or there, but I do not find it annoying and was able to ignore it. :clap:


    OK, my question - is it likely that other people may be affected more than I am and find it unwatchable?

    Also, does anyone know a good CHEAP supplier for replacement lamps.
     
  2. KraGorn

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    There will be some people, a small number, who will find it unwatchable. In extreme cases DLPs can cause headaches, eye strain and other effects caused by their eyes' attempting to resolve the light breakdown.

    That said, most people who see rainbows at worst find them distracting so it's likely that no-one who'll see your system will suffer the more severe reactions.

    Finding Nemo isn't the most ideal movie to watch if you're rainbow hunting, there was a thread here recently discussing the best DVDs to audition DLPs for this effect.
     
  3. Nick_UK

    Nick_UK
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    Some people will notice it more than others. I must admit that I did not see it at all on my Benq 6200 until I started looking for it, then I saw it all the time :)
     
  4. mfairclough

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    My experience of the rainbow effect.

    I had the Optoma RD50 on order and it was scheduled to be delivered tomorrow morning. My retailer told me that once delivered I could not get a cash refund and as this TV is new there was nowhere to go to demo it. I followed some advice in another thread and took the whole family to Comet to see if they or I could notice this effect on the very similar Sagem Axium. I took along the Gladiator DVD (Chapter 24 will show this effect clearly if you are prone to it) plus a Star Wars movie and a black and white Twilight Zone.

    Once in Comet I found that my oldest son didn't notice rainbows, my 4 year old was too young to ask, I did notice them a bit but was not bothered by them, but my wife was very suseptable to it - arrgh! She saw it alot on the Gladiator DVD and to a lesser extent on the other two and it did get on her nerves. We spent about half an hour doing these tests and on the way home she did feel a bit queesy. Questions which sprung to mind were 'will the RD50 be the same', 'over time might we get used to the problem or no longer notice it', 'will this effect be noticable on some/all Sky channels', 'what if they also affect my youngest son" etc.

    Although this test was not done on the RD50, I decided I could not take the risk of spending £2k on a TV for which I could not get a refund and which might annoy or in the very worst case make one or more of my family ill whenever they watched it.

    Basically, if a DLP TV is to be viewed regulary by more than one person then I would recommend that all viewers see it first before buying unless your retailer will give a full refund if your not happy. If you've reading this but already have your new TV then my advice would be don't go looking for this problem.
     
  5. mattwakeman

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    I'm in the 'watch it for more than 20 minutes and start to feel strangely queasy' camp. Yeah I can fight through it, but hey, how many films are worth that much pain?!
     
  6. zombie_donkey

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    I watched T2 on it last night - on a sheet (still arranging a screen) and I do notice the rainbows. I think I am only really noticing it because I am looking for it.

    I read that it affects blue eyed people the most - mine are green. I will have to wait and see if any blue eyed freinds are badly affected.

    a 70" screen with no niticable lines in my pokey home cinema Still the most awesome flippin thing I have ever seen :clap:

    I hope the Rainbows do not show up more on a proper screen, or in HDTV mode.
     
  7. digisocialist

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    I demo'd the SP 4805 in about Aug/Sept and noticed the rainbow for a split second. My heart sank and I spent weeks thereafter trying to come to terms with the possibility of getting an LCD PJ. I then went to Sevenoaks in Leeds in Oct and didn't notice it once. The picture was stunning and I suspect there may be an elemnt to set up (as well as susceptability) which leads to the disposition. I compared it to the Z2 and the 4805 blew it away. This has only re enforced my view of LCD and DLP i.e. DLP just look better. I'm going for my 3rd demo of the 4805 just to be absolutely sure and this time taking the wife. I do think then that it's worth repeating demo's on DLP's just to see if the set up offere by different retailers makes for a marked reduction in the effect. If the wife see's the rainbow then I will have no option but to purchase LCD.. in which case I could be asking questions for another 6 months!
     
  8. Gavin_Hall

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    I'm in the camp where I find watching a DLP quite painful!! I was viewing a Sharp projector the other day, and whilst the image is a lot better than my Z2, I found I was constantly frowning, unable to relax at all. Whilst not seeing a lot of rainbows, I just couldn't relax my eyes and felt quite heady afterwards.

    Oh well, I'll just have to wait and see what the 3-chip DLPs are like :D
     
  9. KraGorn

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    My experience started with a home test of an NEC HT1000, a 4x 6seg machine. Great picture ut the rainbows annoyed me, though luckily I wasn't as badly affected as you Gavin.

    The earlier this year I decided to try again, wanting the improved PQ of a DLP so I bought a Sharp Z200E, a 5x 6seg pj. At first the rainbows were as distracting as with the NEC, though I guess slightly less intense due to the faster wheel.

    Anyhow, after a week or so I was no longer seeing them anywhere nearly so often .. or more accurately I wasn't noticing them so often .. and now they bearly register with me.

    Clearly demoing is important in case you really are badly affected, but my experience is that a 2-hour demo could put you off whereas a longer trial could prove that you can live with them and gain the benefits of the technology. Of course, it helps that I was able to buy 'just to see' and suffer the 'loss' if I couldn't live with it. :)
     
  10. chilli

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    Kyle: Hey Stan. Did you see that rainbow this morning?
    Stan: Yeah. It was huge.
    Cartman: Eh. I hate those things.
    Kyle: Nobody hates rainbows.
    Stan: Yeah. What's there to hate about rainbows?
    Cartman: Well, you know. You'll just be sitting there, minding your own business, and they'll come marching in, and crawl up your leg, and start biting the inside of your ass, and you'll be all like, "Hey. Get out of my ass you stupid rainbows."
    Stan: Cartman, what the hell are you talking about?
    Cartman: I'm talking about rainbows. I hate those friggin' things.
    Kyle: Rainbows are those little arches of color that show up after a rainstorm.
    Cartman: Oh. RainBOWS. Yeah, I like those. Those are cool.
    Stan: What were you talking about?
    Cartman: Huh? Oh nothing. Forget it.
    Kyle: No. What marches in, crawls up your leg-...
    Cartman: Nothing.
    Kyle: - -and starts biting the inside of your ass?
    Cartman: Nothing.

    DLP rainbow effect was too noticeable when I demoed a Infocus 4805 (?I think that was the one) ended up going for trusty LCD HS20. :D
    :beer:
     
  11. Louis Mazzini

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    I'm one of those who can't live with DLPs: For me, the rainbows are annoying (on ALL single chippers I've seen), but the headache/eyestrain is a much bigger problem.

    Over the last nine months I've demoed various projectors with four friends, all in the market for a first machine, all approaching it in an unbiased way, and we all suffered the same with DLP. So, from my experience, magazines dramatically underplay the problem which plagues this technology.

    No doubt though that if you don't suffer, you can get stunning pictures with TI's chips. Having said that, the current £1500 LCDs look like than can seriously question the point of £2000+ DLPs. Right now I'm waiting for sensible pricing on three-chip DLPs (I keep looking at the Infocus 777 appearing in AV-Sales ad at the top of this page and wishing I had a spare twenty grand...)
     
  12. AMc

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    I demoed a presentation DLP projector at home and noticed rainbows quite a lot.
    I bought a home cinema DLP projector and if I look for them (wiggle my head around, get really close) then I can see them.
    Funnily when I got it I saw them a lot, probably because I was looking so hard to see them. Now a few months later I don't notice them at all.
    My partner still doesn't understand what I'm talking about when I talk about them :)

    If you were seriously affected as described above the there will be a problem. I personally feel that the drawback is over represented when you read around the web about PJs because people are more inclined to post about a problem than they are to say "mine's fine".
     
  13. jhjerpe

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    This thread sounds a little like Rainbow Anonymous! :) Maybe through group therapy we can all overcome our worst rainbow fears ;) .
     
  14. Nick_UK

    Nick_UK
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    Don't explain - ignorance is bliss :laugh:
     
  15. KraGorn

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    Actually it's funny, recently there was a thread where someone was asking about how best to demo DLPs looking for rainbows. Someone suggested viewing a black and white film.

    I commented that only a couple of days before that I'd watched Van Helsing and not noticed any rainbows in the opening black and white section. I watched that sequence again after that comment and sure enough, I could see them when I put my mind to it, yet I could also just as easily not see them when I didn't try ... a fascinating experiment in how one can manage to ignore what obviously is there.
     
  16. mattwakeman

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    Oooh, that might of been me :oops: Hopefully I haven't single handedly destroyed any chances you had of watching black and white films!
     
  17. Nick_UK

    Nick_UK
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    I don't notice the rainbow effect too much on my Benq 6200, but it is most noticeable in scenes where there is a bright spot on an (otherwise dark) background. For example, a candle burning in a dark room, or a bright electric light in a dark surrounding.
     
  18. KraGorn

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    :D .. it was a good tip.

    As I said, unless I tried I couldn't see them and since then I've watched The Longest Day without problems. :)
     
  19. Bogeyed

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    Yes. the first time I saw rainbows was in the early scenes in Gladiator-burning candle(s) in a dark tent-hmmm, and now I know what to expect I see them there all the time. Anyone for a bit of hypnotic therapy!!-if it works for smokers...........
     

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