Thread: RED One MX Birger EF mount back focus issue?

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  1. #1 RED One MX Birger EF mount back focus issue? 
    Member Stian Svendsen's Avatar
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    Hey guys.
    I just picked up a second RED One MX and it's equipped with the Birger EF mount.
    Infinity is way off and I have no experience with this mount, since the Birger mount required the entire
    original mount to be removed (including the part that allows you to adjust back focus) I have no clue on
    how to get this right. Google is not panning out for me either.

    I was hoping someone who's had experience with this mount could maybe enlighten me?
    Does the birger mount allow for back focus adjustments? If so, how?
    If not, what might be the problem?

    Any help would be greatly appreciated, thanks!
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  2. #2  
    Senior Member Joe Taylor's Avatar
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    There used to be a video published online by Birger years ago. Surely it exists in the ether somewhere. Sadly though, adjusting back focus is an absolute bitch with these things and seems to work with some lenses and ignores others. A week later you're back to the drawing board. And be careful with the wires. They are easy to crimp.
    The Crossing Trailer for upcoming acid western inspired by the world of Cormac McCarthy's Blood Meridian.
    https://vimeo.com/105448633

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  3. #3  
    Member Stian Svendsen's Avatar
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    Thanks!
    I have only seen that video being mentioned around the web, even found it embedded somewhere but it's not working now.
    The back focus being different for each lens seem to be more of a problem with the EOS lenses, I use a Nikon F mount on my other RED One
    and it's been working flawlessly for years on ten's and ten's of lenses.

    My plan now is to get a Nikon F to Canon EF adapter and try to adjust for the Nikon lenses instead.
    Hopefully it will work itself out.

    Still looking for advice though.
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  4. #4  
    Senior Member Joe Taylor's Avatar
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    I can't remember if that video was streamed or a download. Let me look for it on some older drives. It's helpful and pretty much mandatory. If not and if Birger is still open for business, try giving them a call.
    The Crossing Trailer for upcoming acid western inspired by the world of Cormac McCarthy's Blood Meridian.
    https://vimeo.com/105448633

    The Lonely Moan
    http://vimeo.com/33643688

    Dead Lonesome A film about Ghost Towns and the Mystique of the Western Landscape filmed in 35mm. http://vimeo.com/6874360
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  5. #5  
    Member Stian Svendsen's Avatar
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    Thanks man, I appreciate it.
    I sent an email to Birger earlier today, I'll post about if they reply.
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  6. #6  
    Hey Stian

    I had one years ago. If I remember correctly there is an adjustment in the form of a disk like spacer that you can turn to expand or contract. If you remove the mount to investigate I bet the adjustment becomes clear. It will probably take a lot of trial and error to get it perfect though.

    Hope that helps.

    Btw. I would just call birger. I called them a few times for support way back when and he was always extremely helpful.
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  7. #7  
    Member Stian Svendsen's Avatar
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    Thanks, Troy!
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  8. #8  
    I would contact Red and ask what's the cost to convert it to the original back focusing setup before I spend money on mounts that may not work. The camera is worth it now and in the long run.
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  9. #9  
    Member Stian Svendsen's Avatar
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    I figured it all out, it's real simple actually.
    Back focus is adjusted by a "wheel" hidden by part of the Birger mount.
    I only have shitty EOS zoom lenses so fine tuning back focus is a total hassle.
    I ordered a Nikon adapter to use my Nikon primes to get the adjustment where it needs to be.

    The Birger mount is actually really nice, if only I were using Canon lenses.
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