Thread: BMPCC4k - Follow focus body flex

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  1. #21  
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    Quote Originally Posted by Harry Lime View Post
    Here's an interesting one.

    I have my Pocket 4k mounted on a Berkey Systems baseplate with no cage. It's mounting an Olympus 2.8/12-40mm with 0.8 focus gear driven by a Chrosziel follow focus. The torque from the follow focus is actually flexing the carbon fiver body at the attachment point to the baseplate and you get a nice up and down tilt, depending on in which direction you are puling focus.

    Anyone else seen this?
    Yep, seeing it here too after I just added the DJI Ronin-S follow focus motor to my gimbal.

    When the motor reaches the end of the lens' focus range, there's a distinct tilt up or tilt down, depending on the direction of focus. It certainly looks like the base of the camera is too narrow to prevent tilting in this way. I was hoping to go cage-free - to keep everything as light as possible on the gimbal - but looks like I'll have to use one one now when using my only MFT lens, the Olympus 12-100. With the speedbooster I can use the support foot, but for most of my event work the 12-100 is going to live on the camera.
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  2. #22  
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    Is the base plate thinner than the bodies width? That'd give the follow focus an extreme amount of leverage of it is.
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  3. #23  
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  4. #24  
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    Not sure if I tried with the GH5, but with the GH4 using a follow focus on the Veydras would cause the lens mount to flex when hitting either end of the focus range. Only solution was to use a follow focus with hard stops.

    If using lenses with a long focus throw, such as Veydras, a follow focus that’s geared slowly (for dSLR lenses) may not allow setting hard stops that cover the entire focus range of the lens.
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