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Robert Brahms

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About Robert Brahms

  • Rank
    New
  • Birthday 09/03/1986

Profile Information

  • Occupation
    2nd Assistant Camera
  • Location
    Berlin, London, Atlanta
  • My Gear
    ARRI Alexa, VariCam LT, Sony F65
  • Specialties
    Digital cinema camera work flows and specialities.
  1. As stated already, use the certified covers regarding your camera model to be in the accepted range of treatment. In my home country this is even required by the rules of the production ensurance and the coverage of it in worsed case.
  2. Thanks for all the helpful replies! Very much appreciated. I just take my job very serious and tend to bother more than required but do it in the right time (not while shooting, but when I write my reports). But I think it is better than the opposite. The available torque adjustment of this unit here (I do not want to promote brands) has a minimum of 30% adjustable but still too powerful in case of lost calibration for end to end point in my opinion. From now I tend to care about turning on and off while keeping the wheels off as long as possible. But I think you are right, that this is maybe exceptable rig squeezing, if not too often and not too much.
  3. I know ... old post but still often asked, that's why: I would even go further and say that a full DCI 4k Monitor in a useful color grading cockpit studio size isn't very helpful to check sharpness (unless it is the showroom monitor) because of its very high pixel dense. You would need a very large monitor to not get tired checking sharpness on such small pixels. I kicked them out of our grading rooms because even the grading software interface was unreadable (tiny fonts etc). To check sharpness you eather tend to zoom in to 100% 4k and check the sharp parts, not the whole picture. Therefore a UHD or even WQHD monitor is enough. Every video player or ffplay is able to be set playing unscaled 1:1 and you move the needed part into the monitor range. Sharpness should be checked long before grading anyway.
  4. The wireless lens control system used here comes with a very strong default torque, causing a strong pressure from top down on a robust lens when hitting the end point of the lens focus spin, if the calibration has failed or has been accidently changed or reset. I watched with eagle eye how the whole camera body horizon including the lens dipped down on the front side coming minimally closer to the rods, mounted on a shoulder rig and slipped into a VCT plate on a Sachtler fluid head and tripod. I was shocked about this situation, asking myself if there is any hidden damage on the body or the PL-mount or the lens now possible. Since this is an expensive robust cine lens, I do not worry about the lens focus ring that much. But exactly this sturdiness has caused the body-lens axis to come down based on the lens control motorized cogwheel trying to spin ahead. And even serious professional digital cinema bodies come in various levels of robustness and I think/worry about which week point could have been stressed here (and I hope for the baseplate / shoulder-plate connection, not for the bottom of the body or even worse, the PL mount lens connection). I deeply hope that this had no effect on the PL-mount, or the mount-sensor construction, nor on the metal body of the professional digital cinema camera itself and that this small movement is maybe acceptable(?) in terms of baseplate flexibility or the whole rig. Thus my question since I never had such scenario to compare to before. I would love to hear from some long year experienced DPs or Ass. that this minimal dipping is not such a dangerous thing like I think it is, at the moment. Maybe a dip of one or two millimeters, on a lever length of 200-300mm (body + lens) all together. But you can see it when you concentrate your eye on the horizon of the body-lens level in comparison to the rods below and the background behind. The rods stay horizontal while the body-lens axis comes down forced by the pressure of the lens control cogwheel on the lens. Additionally, I wonder if the motorized lens control system cogwheel was always that noisy before, or if it has been damaged by this little event from before? Can anyone share experiences with such situations? I doubt that this is a rare case since such systems often "forget" their calibration end points. All I wonder is, why the torque was so strong that it was able to dip/squeeze the body-lens axis down closer to the rods a little bit. (Torque was 50%). I carefully tried to check the flexibility of the baseplate shoulder-plate connection, but I am not able to reproduce this dipping, so the torque must have been quite strong to create this dipping. I did a sketch of the whole thing to illustrate it better.
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