Thread: Lens keeps losing communication with Brain -- Any ideas what's going on?

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  1. #1 Lens keeps losing communication with Brain -- Any ideas what's going on? 
    Senior Member Dave Draper's Avatar
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    Apr 2008
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    Focusing using a Teradek Smartknob on our Weapon 6K CF. Lens being used is a Sigma Art 35mm f/1.4.

    Randomly, the lens loses communication with the brain -- so all lens information in the top left hand corner of the screen disappears, including aperture information -- and the lens no longer responds to any electronic commands (focusing, iris, etc).

    Haven't tried other lenses, to see if they experience the same issue.

    Re-seating the lens doesn't resolve anything, but restarting the camera does.

    Running firmware 7.1.0.1.

    Any clues?
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  2. #2  
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    Sep 2012
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    Not sure, but I was having issues on the previous build with my Canon EF lenses - every time I was pulling and getting it to "in-focus", the monitor would glitch, go extremely fuzzy, then turn on some sort of hard-edged focus (and I wouldn't actually be in focus anymore).

    I reloaded firmware and it went away, though.
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