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Optoma H77

Discussion in 'Projectors, Screens & Video Processors' started by Edgeyboy, Feb 23, 2005.

  1. Edgeyboy

    Edgeyboy
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    Is anyone able to share their experiences of the Optoma H77 - Perhaps someone who has had one for a month or so ?

    Does the colourwheel run at 5 speed for 50Hz as well as 60Hz ?

    many thanks

    Tom
     
  2. KraGorn

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    Great machine. Mine's run for something like 200 hours.

    The colour-wheel slows down for PAL so I reckon it's running at 5x all the time. Why do you ask? I can't think of any reason why it would drop down to, say, 4x.

    Were you perhaps wondering if it can run a 6x @ 50hz to be the same speed as 5x @ 60hz (one or two machines can I believe), listening to the Optoma it clearly doesn't do that.
     
  3. Edgeyboy

    Edgeyboy
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    Hi

    For some reason, I thought colour wheels generally spin slightly slower on PAL (50Hz) material, hence the question.
    Is what you're saying that the wheel spins at 5x regardless of PAL / NTSC ?

    Many thanks
     
  4. They

    They
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    The rotation rate is 5x the video rate (divided by number of RGB groups x 60 for revs per minute) therefore the RPM will be less for PAL than NTSC but it's still 5x for both.

    9000rpm - NTSC (5x60x60/2)
    7500rpm - PAL (5x50x60/2)
    This is for 6,7 & 8 segment colour wheels. (i.e. 2xRGB groups in each case)
     
  5. Edgeyboy

    Edgeyboy
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    Thanks for that.

    So does that mean you are no more likely to see colour wheel artifacts on PAL than NTSC ?

    Tom.
     
  6. KraGorn

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    Yes, it's 5x framerate.

    In theory you're right that sine the wheel's running slower in PAL mode then rainbows would be easier to see .. in practice I doubt that's often seen.

    As I said, I know there's at least one projector which switches to 6x in PAL mode so it stays at 300hz but I don't think HD(+) panels support that.
     
  7. Edgeyboy

    Edgeyboy
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    Does the H77 work fine with PAL material now? I seem to remember reading some posts a while back about a few issues.

    Anything else to watch out for ?
     
  8. Liam @ Prog AV

    Liam @ Prog AV
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    PAL Firmware was the reason for the (very) delayed launch. Am happilly watching PAL on mine without issue :D
     
  9. venezolano

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    Liam,

    do you mean that there has been released a new firmware that fixes the color banding trouble? And what about the Mitsu HC2000?

    Regards
     
  10. Liam @ Prog AV

    Liam @ Prog AV
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    There is some colour banding but not the intial tearing that prevented the launch from happening when it should. As far as I'm concerned I've bought one of the best value HD2+ on the market so I can't complain. If I wanted perfection I would stump up for a Sim2 (but I'm stubben and poor so I won't... yet)
     
  11. KraGorn

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    I have to say I've not seen any colour banding .. NO, don't tell me what to look for. :p
     
  12. uczmeg

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    Once you are happy with an item, you should NEVER read the forums again.

    It's cost me so much money...
     
  13. martian1

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    Thats very good advice, if you start looking you will find problems. I have just got my pj this week [not a optama] and as long as it looks good to me i will try and avoid this forum :smashin:
     
  14. Gary Lightfoot

    Gary Lightfoot
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    I'm very pleased with mine now.

    The color banding was there before the firmware upgrade, and is all but gone now. I can't say that I've seen anything that has really distracted me whilst watching a movie. You can adjust the colour wheel timing index while watching an image with banding and reduce it if you have it, but I think that if it's there, it'll be very minimal now.

    It's quite a bright projector on a 7ft wide screen, though it will dim with time as the lamp ages, but there are ways round it.

    Liam,

    Have you used Colorfacts on it yet? If so, what settings did you arrive at? I'm using an FL-Day filter combined with a skylight filter for colour correction (was using an 81b+ sl at one point), contrast improvement and getting the ft lamberts down nearer to 12. I just wonder how much of a tweaker you are. :)

    Gary.
     
  15. KraGorn

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    Gary, how do you get to the service menu?
     
  16. Gary Lightfoot

    Gary Lightfoot
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    I think it's by pressing re-sync, source and enter together on the pj.

    It's been a while so I could be wrong.

    Gary.
     
  17. Liam @ Prog AV

    Liam @ Prog AV
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    No colourfacts here mate. Running it from whichever Lumagen I happen to have at the time (for demo) or the Crystalio we're gonna get :D My kit changes so much it doesn't seem worth strangling the best out of it with colourfacts if I'm only gonna have to do it all again every other week! Plus I haven't got colourfacts which makes things decidedly more difficult!

    Venezonlano - as others have said, banding is all but gone. I'm not gonna say it's banding free, any projector built to a price point has it's limits. But you need hawk eyes to see it and it's only gonna happen on the hardest of material. I don't remember seeing any for quite some time (but I'm now gonna be bloody looking for it too!!!). In other words rest your fears and get one!!
     
  18. KraGorn

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    Am I right in thinking that 'banding' is aka. 'posterisation'? I see very mild examples of that once in a while.
     
  19. Liam @ Prog AV

    Liam @ Prog AV
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    You are quite right Kragorn, although I find many confuse the two so you can't be sure who is talking of what!! But I'm gonna stop talking about it now before we all get depressed with our displays!
     
  20. KraGorn

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    I can live with it, the H77 is a superb machine and is as near to a Sim2 300 as I could reasonably shell out for. :)
     
  21. Liam @ Prog AV

    Liam @ Prog AV
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    My sentiments exactly.
     
  22. KraGorn

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    Of course Liam, when you're selling 3-panel DLPs for £5K I may just raid my piggy-bank again. :D
     
  23. Liam @ Prog AV

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    Well that's only if this new Qualia doesn't give triple-DLP a very scary run for it's money...
     
  24. KraGorn

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    That's just a joke, surely? I mean 3 projectors, 3 times the noise, 3 times the heat .. ont for Joe User IMHO.
     

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