Thread: RED Epic-W Helium Noise Issues

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  1. #1 RED Epic-W Helium Noise Issues 
    Hi,

    I apologize if this has already been asked a lot but I'm having some really bad noise issues when shooting with this camera.

    I have some test footage here (sorry in advance I know it's not the best test footage) at different ISOs and different frame-rates: https://drive.google.com/open?id=1fx...PWTb3u25t8Tl6F

    The camera was auto calibrated before shooting these. Can anyone let me know why there's so much noise in the image?

    Thanks!
    Ben
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  2. #2  
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    Hi, Benjamin!
    Could you repeat this test, but this time:
    - Record at REDcode 5:1, not REDcode 12:1
    - Record 8K, not 6K
    - Record 24 fps, not 60 fps

    See how it goes.
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  3. #3  
    Thanks so much for your reply, I've included a clip that was shot with those specifications (6:1 not 5:1 but fairly close!), still having significant noise issues:
    https://drive.google.com/file/d/1Ka8...ew?usp=sharing
    https://drive.google.com/file/d/1tmU...ew?usp=sharing
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  4. #4  
    Quote Originally Posted by Benjamin Reyes View Post
    Hi,

    I apologize if this has already been asked a lot but I'm having some really bad noise issues when shooting with this camera.

    I have some test footage here (sorry in advance I know it's not the best test footage) at different ISOs and different frame-rates: https://drive.google.com/open?id=1fx...PWTb3u25t8Tl6F

    The camera was auto calibrated before shooting these. Can anyone let me know why there's so much noise in the image?

    Thanks!
    Ben
    Are you pixel-peeping at 1:1 pixels? I see chromatic aberration as the #1 bug-a-boo in your shots, and I see noise in the skin only when the magnification is at the level that skin normally has its own blotchy characteristics. When I look at UHD scaling on my monitor, I'm not seeing a big problem. Maybe clip A003_C014 is a little dicey, but the shadow side is 5 stops below the lit side, which can be dealt with a number of ways (temporal noise reduction, desaturation of shadow areas, etc).
    Michael Tiemann, Chapel Hill NC

    "Dream so big you can share!"
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  5. #5  
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    Quote Originally Posted by Benjamin Reyes View Post
    Thanks so much for your reply, I've included a clip that was shot with those specifications (6:1 not 5:1 but fairly close!), still having significant noise issues:
    https://drive.google.com/file/d/1Ka8...ew?usp=sharing
    https://drive.google.com/file/d/1tmU...ew?usp=sharing
    Hm...it does look a bit noisier than usual, for ISO 800, to me. But then again, for STH OLPF - not that much. I'd also say that you are a stop under. Or so.
    Did you use any filtration in front of lens? CTB maybe?
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  6. #6  
    Hm, no on my monitor I'm definitely seeing the grain even when looking at a scaled down image, and it's definitely a concern for playing video on larger screens. You're right that there is aberration as well, could be because of the crop factor of the sensor at 6K. Even if the shadow side is 5 stops below the bright side shouldn't it be fairly clean at ISO 500 or even 640? I was able to solve some noise issues with NR but that shouldn't be a necessary part of the post-production process right?
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  7. #7  
    Does the STH OLPF introduce more noise into the footage? I'm not very familiar with the different OLPFs...No filtration was used.
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  8. #8  
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    Quote Originally Posted by Benjamin Reyes View Post
    Does the STH OLPF introduce more noise into the footage? I'm not very familiar with the different OLPFs...
    Yep. It's because of the filtration - you loose light on the way in, the S/N ratio drops a notch, then at the development stage the signal gets pushed a bit. It's said with STH - ISO 500. Or so.
    Standard 800-1000, and LLO 1280-1600.


    No filtration was used.
    Strange.



    Is that wall behind you supposed to look that blue?
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  9. #9 Noise 
    I just shot a scene the other day, we had an Amira and the S35 8k Helium,

    Because the noise was bad on the Helium, super noisy actually, was unable to punch in on our 4k finish with the Helium. Actually it was ironic, the 3.2k out of the amira, was able to punch in to 150% for the 4k finish better. I'm not sure if their rental was problematic...

    Noise kills resolution for sure,
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