Thread: BMPCC 4K paired with S35mm lenses and a Speedbooster?

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  1. #1 BMPCC 4K paired with S35mm lenses and a Speedbooster? 
    Senior Member Grug's Avatar
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    Hi everyone,

    I'm trying to figure out if the BMPCC 4K will work with S35mm/APSC lenses and a 0.71x Speedbooster?

    Specifically the Sigma 18-35mm T/2 (which I have in a PL mount).

    Sigma lists the image circle of the 18-35mm as 28.4mm

    And by my calculations, the 18.96x10mm sensor of the camera should require a 21.44mm image circle to cover it.

    Now if we multiply the 28.4mm image circle of the Sigma by the 0.71 magnification of the Speedbooster, it reduces to 20.16mm. Or 6% shy of full coverage on the BMPCC 4K's sensor.

    So, mathematically at least. I'd assume it's not quite going to achieve full coverage. But I'm wondering if anyone can speak to the specific combo, and whether it results in a hard vignette? Or just a soft (and therefore potentially usable) one?

    Cheers
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  2. #2  
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    The first official footage from the Pocket 4K was ‘Nature’, which was filmed by Mark Wyatt using the 18-35mm f/1.8, & Rokinon 50mm, mounted to a SpeedBooster Ultra.

    https://vimeo.com/286842478/description

    May be worth shooting him an email.

    https://wyattvisuals.com
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  3. #3  
    Senior Member Grug's Avatar
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    Cheers Bern, will do.
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  4. #4  
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    Im going to be getting the bmpc 4k this weekend and my main combo is the sigma 18-35mm with the 0.71x speedbooster. I will be posting videos here for sure.
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  5. #5  
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    I have this exact setup, just haven’t had time to even mount a lens on the P4K yet. Will tonight.
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  6. #6  
    Interested as well.
    This is from someone who's shooting with an XL 0.64. I asked the guy if that was all the vignette but he said he enlarged by a 5% if I recall correctly.
    https://m.youtube.com/watch?v=6wai4J8RUlI&t=5s
    alvise-tedesco.format.com
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  7. #7  
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    Here's some footage I took last night, I was kind of wasted after some (read a lot) drinks after work, but yeah, shooting with the 0.71 metabones and Sigma 18-35. I don't know if you'd like a better lit example but yeah, here goes.

    https://we.tl/t-u0nkNHIEzy
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  8. #8  
    Senior Member Eli Hershko's Avatar
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    I have the original mft to ef bmpcc 0.54x speedboster... will that work with the 4k?
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  9. #9  
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    Quote Originally Posted by Eli Hershko View Post
    I have the original mft to ef bmpcc 0.54x speedboster... will that work with the 4k?
    I have it too, but I'm scared of putting it on before I hear someone else confirm it works.
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  10. #10  
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    I'm hoping that Metabones will make a SB specifically for the BMPCC4K like they did with the original BMPCC. The SB would support for FF and APS circle coverages without requiring two SBs. The latter would suck.
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