Optoma Introduces 4K UHD Laser Home Cinema Projector – UHZ65

Discussion in 'Frontpage news' started by Hilbert Hagedoorn, Oct 18, 2017.

  1. Hilbert Hagedoorn

    Hilbert Hagedoorn Don Vito Corleone Staff Member

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  2. Mufflore

    Mufflore Ancient Guru

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    I'm annoyed with Optomas money grab on repairing projectors (not cheaply) that fail too soon because they dont include an air filter despite needing one.
    But this looks interesting, as long as it doesnt require cooling that needs a filter ;)
    $5K is high but it should last 7 years at 8 hours per day.
    I wonder if they will provide a reasonable cost light source replacement and a guarantee it will reach 20K hours before needing replacement.

    While it supports HDR10 there isnt enough bandwidth to do that at 4K60 with 4:4:4 colour, it will have to be 4:2:2 or 4:2:0.
    Fine for all video and those that dont mind a small drop in colour quality when gaming.
    But at least it supports HDR10.

    "For anyone not utilizing the superior audio and video quality of HDMI..."
    Ahem.
    HDMI doesnt define the quality, its only a transport.
    PJs dont have superior audio quality nor good placement for audio bass or effects.
     
  3. John Nemesh

    John Nemesh New Member

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  4. SimonSays

    SimonSays New Member

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    Chroma subsampling does negatively affect text and other non-noisy images like presentations and such. Then again what kind of environment would need to show powerpoints at 4k.

    Re: HDMI quality. It's just a transport yes but it's a better transport than all of the other I/O offered on this device.

    Not knowing anything about laser projectors, I'm wondering if it's three laser sources that can be independently replaced if they burn out. (white laser being an oxymoron of course)
     

  5. Mufflore

    Mufflore Ancient Guru

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    Your quoting skills need some work, I'm not going to work on your text.

    Yes moneygrab.
    They wanted £170 to repair a fan that suffered because it was coated in dust.
    It only lasted until just after the first bulb had to be replaced.

    I'm not against filters, I am for them.
    The filter wasnt optional, it was none existent, they didnt include one in my projector so it coated everything inside with dust!
    Quite hard to clean a none existent filter.

    I'm not wrong about the bandwidth.
    17.8GBps is needed for 4K60 4:4:4 Chroma with 8 bits per colour.
    If you want HDR10 thats 10 bits per colour so the Chroma Subsampling has to be reduced to maintain 60Hz.
    This will help
    http://www.belden.com/blog/datacenters/Understanding-4K-Necessary-Data-Rates.cfm
     
  6. John Nemesh

    John Nemesh New Member

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    You are starting to sound a bit hostile with your posts...dont know why you are bent out of shape. In any case, HDMI 2.0 only supports 4:4:4 color at 8 bits depth at 60fps. You want better than that, you need HDMI 2.1. So I dont understand your gripe...it has NOTHING to do with Optoma. No other product on the market supports 10bit 60hz 4:4:4 color. PERIOD. And $200 is quite reasonable for ANY repair outside of warranty coverage...and dust buildup is definitely something that is YOUR problem, not the manufacturers. Get an air purifier for your room if it's that big of an issue...or you know, CLEAN once in a while.
     
  7. Mufflore

    Mufflore Ancient Guru

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    If you had read my first post properly you would understand my annoyance with Optoma.
    The projector was still within warranty under EU law but they refused to honour it.
    You are still treating my issues as insignificant due to your lack of understanding and inability to read.
    And as explained for the 3rd time now, the dust build up problem was not caused by me, it was caused by Optoma.
    The only way to clean the projector is disassemble it, which I did.
    So again you are wrong.

    Now you are speaking as if I have a gripe with the laser projector.
    I have only stated facts so people know what they will get, its odd you dont like that.
    ;)
     
  8. geogan

    geogan Master Guru

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    There is only a single laser diode light source in all these consumer PJs. This light is then split by prisms to produce the red, green, blue lights.

    Anyway, regarding this PJ and all DLP based ones, I hear that the colour wheels used in these in not very good at reproducing the wider colour gamut used in 4k UHD standard, they are just about able to get REC709. Also as with all TI DLP PJs, the chip only has 4 million mirrors and they use something similar to e-shift device to get the 8 million needed for 4k. Still better than HD PJ though, and much sharper than 3-chip LCD/LCOS/XSRD type devices as long as lenses are similar quality.
     
  9. CinemaPete

    CinemaPete New Member

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    I just came across these posts on the Optoma UHZ65. I'm considering the UHZ65 myself, moving up from a Panasonic AE4000 (year 2009). I'm an electronics engineer by training, and I don't want to get into a pissing match about the technical attributes or lack thereof for the various specs on the UHZ65. However, per Optoma's current spec sheet they indicate it is HDR10 (rec.2020) compatible.

    In terms of Color Depth they indicate:

    3840x2160 @30Hz
    YUV 4:4:4 (8bit, 10bit, 12bit),
    YUV 4:2:2 (8bit, 10bit, 12bit),
    YUV 4:2:0 (8bit, 10bit, 12bit)

    3840x2160 @60Hz
    YUV 4:4:4 (8bit),
    YUV 4:2:2 (8bit),
    YUV 4:2:0 (8bit, 10bit, 12bit)

    Now, If you go to the HDMI . org website and look up HDMI 2.0 you'll see (this is an excerpt):

    Does HDMI 2.0 support BT.2020 (rec.2020) colorimetry?
    Yes. HDMI 2.0 includes support for BT.2020 Colorimetry with 10 or more bits of color depth.
    Video Formats defined in BT.2020 and supported by HDMI 2.0 specification:
    – 2160p, 10/12 bits, 24/25/30Hz, RGB/4:2:2/4:4:4
    – 2160p, 10/12 bits, 50/60Hz, 4:2:0/4:2:2

    This link will show you a chart with a breakdown of HDMI 2.0 and color space 4k@30, 4k@50 AND 4k@60 that it supports based on the bit depth: https://www.hdmi.org/manufacturer/hdmi_2_0/hdmi_2_0_faq.aspx#146

    You can see from the chart that for 4K@60, a 4:4:4 color space is supported only at 8 bits.

    And 4:4:4 10-bits is supported at 4k@24, 4k@25 and 4k@30

    Hope this helps with this discussion.

    More importantly, I want to know what the opinion of anyone that has a UHZ65 is to help with my purchase decision.

    Thanks all.
     
    Last edited: Oct 26, 2017
    Mufflore likes this.

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