Thread: Rawlite UMP OLPF.

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  1. #31  
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    Quote Originally Posted by david evans View Post
    Hey John, do you find that IR on the olpf to be any more effective than other IRs out there? Because if the low pass filtration is so subtle, it feels like it's a very expensive IR cut filter. Also, do you know if there will be one for the regular UM 4.6k?

    Thanks
    Well from what I've seen the ursa isn't too terrible for moire, so it'd only need to take off the last bit of anything intrusive or distracting, so I'd say it's worth it even more for keeping IQ high and any distracting moire low. The IR is a nice bonus.
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  2. #32  
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    Quote Originally Posted by david evans View Post
    Hey John, do you find that IR on the olpf to be any more effective than other IRs out there? Because if the low pass filtration is so subtle, it feels like it's a very expensive IR cut filter. Also, do you know if there will be one for the regular UM 4.6k?

    Thanks
    IR isn’t as simple as it’s there, or it isn’t. As you filter or reduce your IR, you’re also starting to crossover into visible light and this affects your colour, and especially skin tones. You don’t want to get rid of red altogether right? You want stuff that’s red to still be red and show up to the sensor. But light doens’t just change from red to infra red. It’s continuous, especially if you’re lightning with tungsten. So where you position that cut and how gentle or aggressively you slope that cut is what the difference is between many of the IR filters out there.

    One of Ursa’s weaker response was in tungsten lighting with real actual tungsten lighting. I didn’t test pre gen4 here, but I know one of the main goals of Gen4 was to address shooting under tungsten.

    So what i see as an end result, is perhaps a conflation of better choice about where to position the IR cut and slope AND the way gen 4 sees under tungsten lighting and far less false colour moire.

    It’s subtle. But I think it’s worth it. I bought five filters for my cameras.

    JB
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  3. #33  
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    Thanks JB. Do you know if there will be a olpf for the regular mini 4.6k?
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  4. #34  
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    Quote Originally Posted by david evans View Post
    Thanks JB. Do you know if there will be a olpf for the regular mini 4.6k?
    The filter is the same I believe, it’s just the mechanics of how it’s installed that would be different.

    JB
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  5. #35  
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    Just ordered mine! Can’t wait. Will post back with some tests when it arrives.

    Re: shimming, Hans confirmed that shimming could be done with the shims included with the PL Mount. Switching from EF to PL only involves adding a 0.1 shim (I think?) so the 0.3 and 0.15 can be used to counter the OLPF.
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  6. #36  
    Senior Member jambredz's Avatar
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    Quote Originally Posted by david evans View Post
    Thanks JB. Do you know if there will be a olpf for the regular mini 4.6k?
    It's in development according to rawlite
    Darren Scott
    Freelance Director/Director of Photography


    https://vimeo.com/jambredzvisions/videos
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  7. #37  
    Does anyone know if the Rainbow Flare mask needed for this?
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  8. #38  
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    Quote Originally Posted by jefferypeterson View Post
    Does anyone know if the Rainbow Flare mask needed for this?
    The mask is still fitted and required.

    JB
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  9. #39  
    Ok thanks.
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  10. #40  
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    Info from rawlite:
    "The optical OLPF component will work with the regular URSA Mini 4.6K, since it has the same sensor. But we haven’t examined the mounting of the filter in the URSA Mini 4.6K
    This is on our to do list. I will keep you informed".

    Well. Gonna wait.
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