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Rainbows and overtiredness

Discussion in 'Projectors, Screens & Video Processors' started by sniffer66, Mar 23, 2005.

  1. sniffer66

    sniffer66
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    I received and set up my Benq 5120 on Tuesday and was blown away by the PQ and very pleased that I couldnt make out one rainbow in about 4 hrs viewing

    On Tuesday night I worked nearly all night and ended up having about 3 hrs sleep.

    Last night the wife and I watched Star Wars -Attack of the clones- to get ready to see No 3 :) .

    As I got progressively more tired and my eyes began to blur I started to see the odd rainbow - the wife couldnt see any at all

    Anyone know if there is a correlation between seeing rainbows and tiredness ?
    After 10 hrs sleep last night they've gone again :)
     
  2. MR.COATES

    MR.COATES
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    I've got the 5120 in my basket (will just sell the Xbox) - seems like a cracking price.

    I know not to expect the earth but all I want is a screen in my living room that's bigger than my 32" TV that I can use to watch films and occasionally play games.

    I honestly think this is the one to go for despite this 'rainbow' issue.
     
  3. sniffer66

    sniffer66
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    I only saw the rainbows when I was really tired, looks fine again this morning.


    Agreed on the 5120. I'm on a 7' wide screen and from about 12' and further away I cant see any pixellation. Beautiful PQ as well :smashin:
     
  4. MR.COATES

    MR.COATES
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    Well my living room isn't huge - looking at about 4m sqared.

    A mate of mine has got a 16x9 pull down screen going spare (1.8m by 1m) which sounds like just what I need.

    Hopefully I can then place the projector so it's not too close for far away.

    A bit of experimenting may be in order.

    Looks like the easiest way to get the picture to it will be a Scart to Component lead which will let me plug the scart into either my DVD or Pace box.

    For the PS2 & Xbox I've got a scart block so I'll use that for those rather than shelling out for seperate component cables for them.
     
  5. sniffer66

    sniffer66
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    It would be worth you taking a look at www.projectorcentral.com and looking at the 5120 specs. Then use their throw calculator to check distance and screen size. The zoom is only 1.2 on the 5120 and doesnt leave you much scope to maneouvre !! I think I have about 2" to play with in my setup !! (ooer missus)
     
  6. MR.COATES

    MR.COATES
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    Oh I was more thinking about the projector being too close rather than far away.

    Looks like I'll be fine.

    Have ordered by the way!

    :clap:
     
  7. sniffer66

    sniffer66
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    Cool


    Love to know what you think when you get it :)
     
  8. hebawom

    hebawom
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    Rainbow are something to do with the colour wheel being slower than the eyes. I would have thought that tiredness would actually help with the rainbow effect! Since the eye-brain speed would be slower.
    Have you tried watching the same scenes again?
     
  9. ninc0

    ninc0
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    Hebawom,

    I had watched many short clips on dlp machines and not had any problems, but then I was advised to watch for at least 30 minutes to see if then I had any side affects.
    Actually much to my diisapointment I suffered from very bad headaches and eye strain, although I only saw occasional rainbows.

    So maybee dlp doesnt really suit you as a person?
     
  10. hebawom

    hebawom
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    Nope they don't suit me - bad eyestrain.
    But if you read the first post on this thread the guy says he only see them when tired
     
  11. MR.COATES

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    Weird.

    Well time will tell. To be blunt i'll need to suffer from blackouts to get rid of it after waiting sooo long to finally get a projector!!!

    :D
     
  12. PJTX100

    PJTX100
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    Well, with the money you've saved on this you could afford the doctor's fees!.
    Looks a great bargain!
    ..PJ :)
     
  13. MR.COATES

    MR.COATES
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    He he.

    Well I'm sure I can shift the Xbox and Game for £100 so it's basically making the PJ £500 and I can have that 16x9 screen for £20.

    Got everything else (5.1 surround, DVD player etc) so I'm totally hyper now!

    :clap:
     
  14. Clint C

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    Chaps

    When I first got my NEC HT1100 I had a problem with eyestrain and nausea. Basically the advice I received from these forums which have worked a treat is to 1. go for a smaller screen size or 2. not sit so close. This is to do with having to scan a larger picture as there is more side to side eye movement to get all the information in. If you can sit a good distance away from the screen just so you're not scanning so much (obviously find your own sweet spot) then I'm convinced all should be well. I'm currently sitting between one and a half to two times (my cheapo borderless 6 foot wide) screen width and find this very comfortable.

    Having said that, I've just purchased a 7 foot (bordered) wide screen so I can sit further back in my room and will be conducting further experiments to find my sweetspot.

    I'm convinced that with the sale of all these DLP machines that "rainbows" shouldn't effect as many people as it does... we just need to find a comfortable viewing distance.

    Just my thoughts on the matter.

    Clint.
     
  15. MR.COATES

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    I wonder if it's a bit like the 'chicken wire' problem with LCD PJ's.

    If the settings and distance are right, you'll never notice it etc..
     
  16. braiden

    braiden
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    I find I see more rainbows when im tired, when this happens I tend to turn on the 25watt light ive fitted into my cieling then they are almost extinct.
     
  17. sniffer66

    sniffer66
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    Nice one - I'll give some minor ambient lighting a try
     
  18. Mr Grumpy

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    Well I have had my Screenplay 7200 in since Xmas eve last year and in all the viewing (150 odd hours as it stands) I have only seen rainbows in 2 films, and then only for a smallish portion of the film. The common factor on both occasions was the consumption of alcohol. It was a little annoying the first time I noticed them as I had actually started to think that I was not susceptible at all. I also (perhaps foolishly) believed that rainbows weren't an issue on more expensive projectors but I now suspect that all DLP projectors with colour wheels show them to some degree.
     
  19. sniffer66

    sniffer66
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    Sounds to me like self induced eye flicker makes the rainbows worse then.

    i.e. tiredness, blinking or drink :)

    Kinda like a strobe light effect ???
     

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