Thread: Infrared Pollution Control on URSA Mini 4.6K sensor

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  1. #11  
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    Quote Originally Posted by rick.lang View Post
    I passed your observation on to NiSi this evening. They'll be reviewing the tests shortly. I need to do a controlled test to see if there is a difference. I think I mentioned, when I lightly grade the clips, the results are very pleasing. Even the yellow cast on the Vari-ND at ND 1.8 comes up looking fine.
    Rick,

    It's an easy fix in post. Just bring down the green channel. Like I said in an earlier post, for the price range, they are good enough for me. I've learned that you have to spend mega bucks to get almost perfect quality and still, nothing is perfect. Let me know what they say.
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  2. #12  
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    Quote Originally Posted by rick.lang View Post
    I updated the first post in this thread to include Part 3 of my recent tests.
    Rick,

    Part 3 link doesn't work
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  3. #13  
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    Sorry, I had pasted the wrong link! Should be okay now.
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  4. #14  
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    The SLR Magic doesn't look that bad at max and 10. Add a Hoya IR/UV Cut filter to it and you're good. I know another guy who uses the SLR Magic to shoot music videos. He says he uses the Hoya with it and have no problems. I have the Tiffen Vari ND right now with the Formatt Hitech IR/UV Cut filter. I'll do tests this weekend with that set.
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  5. #15  
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    Added Part 4 of the Infrared tests to the first post in the thread. Please read the description. Comments welcome.
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  6. #16  
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    Quote Originally Posted by rick.lang View Post
    Didnít want this issue to be buried in the various threads that discuss the 4.6K sensor. Just posted this to the official BMD forum:

    I have created a four part series from the tests i did 2017-03-04 to examine the control of infrared contamination on the URSA Mini 4.6K PL camera using a variety of filters.

    Parts 1 and 2 feature IRND filters. The question was raised about combining the Mini Pro filters with additional ND filters to see if the Mini Pro filters will suffice to control infrared. Part 2 may answer that question for you as I present the three scenarios.

    Part 1 examines just the 7 NiSi Nano IRND filters which behave in the same manner as the 3 built-in IRND filters found in the URSA Mini Pro cameras.


    https://vimeo.com/207484340

    Part 2 examines the use of the SLR Magic Image Enhancer, B+W 486 MRC IR Cut, and S:R Magic Vari-ND filters alone or in combination with the NiSi filters to approximate how those filters may perform with the built-in IRND filters on the URSA Mini Pro camera. I canít be sure of course because i am not actually testing the Mini Pro.


    https://vimeo.com/207488176

    No password required.

    Please read the additional notes for each video. Hope you find these tests useful. I also have simply graded all these clips and the results indicate that all clips appear to be quite good matches once they are corrected in post. I may present the graded videos if you want to see those, when I can upload them, but next week Iíll upload Part 3 and Part 4 that are specific to the SLR Magic Image Enhancer and the SLR Magic Vari-ND.

    Edit:
    Here is the Part 3 that isolates the SLR Magic Vari-ND II filter so you can judge its efficacy. It is not intended to affect infrared light, but you may see some changes in colour at the maximum setting. It is easily corrected in post.


    https://vimeo.com/208398054



    Edit:
    Here is Part 4 with the NiSi Nano 1.8 first and then with the SLR Magic Image Enhancer added for a subtle improvement to infrared filtration. The SLR Magic Image Enhancer shapes visible light and near infrared and then cuts infrared beyond the Ďnormalí cutoff on most IR Cut filters. I also added a distortion test of the 85mm APO and it looks good as a closeup lens (focus was 9.5í).

    https://vimeo.com/208547087

    Is it confirmed the Nisi Nano IRNDs are the ones used in the UM pro? They look pretty neutral! Is this straight out of the camera or did you do any post correction?
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