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element14 presents Forum Universal LANC controller for DSLR cameras
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  • dslr
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Universal LANC controller for DSLR cameras

Akkapama
Akkapama over 3 years ago

Hi, 

So, I was watching one of Element14's videos from 2020, about a remote zoom controller for a DSLR lens. 

Although this is already quite cool, I would like to see something that goes a few steps further: A LANC controller which you can use on any DSLR lens. 

image

The picture above shows what a LANC adapter usually looks like. It's a small remote unit which has a special thumb stick, which you can rotate to zoom in and out on professional camcorders and production cameras. It is often used in broadcasting environments. 

The further you rotate the thumbstick, the faster your zoom moves. That is the idea. And it should be smooth and damped. So no zoom stuttering or jumping, but gradual smooth zoom. 

Then the controller is mounted on a Tripod or trolly arm, so you can simultaniously operate the movement of the camera, as well as the zoom with just one hand. 

So, to summarize: 

  • Controller needs to be mounted on a tripod arm
  • The thumbstick should provide gradual speeds based on amount of input
  • The zoom should be smooth
  • Since this is meant for video, the zoom should be quiet
  • The mechanism should work with any rotate-zoom lens out there 
  • The above also means that the controls should be invertable, as some lenses zoom clockwise and others zoom counter-clockwise
  • Some bigger lenses require more force to rotate the zoom ring. So the "engine" should be relatively powerful.

Can you guys design something like this and make a video of it? I've been wanting a device like that for aaages since I use my mirrorless full frame camera for video (Superior quality over any pro level camcorder). But I can't find anything like this to buy on the internet. 

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Top Replies

  • mayermakes
    mayermakes over 2 years ago +4
    Since I did the mentioned project, I can tell you the hardest thing is to make a secure and wiggle free connection from the zoom ring to whatever actuator you use. A big difference between Stills DSLR…
  • beacon_dave
    beacon_dave over 2 years ago in reply to mayermakes +2
    When I was pondering something similar to remotely control a lens focus ring, I thought of doing it like a capstan winch. Wrap a drive belt around the lens ring a few times and then have a driven pulley…
  • mayermakes
    mayermakes over 2 years ago +2
    Akkapama Happy to report I have started work on the project!
  • mayermakes
    mayermakes over 2 years ago in reply to beacon_dave +1
    the belt varaint seems quite feasable, only adapting and mounting it with different lenses mightb e atricky topic as they all have different throw circumference etc.
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  • beacon_dave
    0 beacon_dave over 2 years ago

    Perhaps take a look at episode 437 where Clem attempts something similar.  

    /challenges-projects/element14-presents/project-videos/w/documents/4771/episode-437-diy-motorized-zoom-for-your-dslr

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  • beacon_dave
    0 beacon_dave over 2 years ago

    Perhaps take a look at episode 437 where Clem attempts something similar.  

    /challenges-projects/element14-presents/project-videos/w/documents/4771/episode-437-diy-motorized-zoom-for-your-dslr

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  • kellyhensen
    0 kellyhensen over 2 years ago in reply to beacon_dave

    Thanks Dave - you're the best

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  • beacon_dave
    0 beacon_dave over 2 years ago in reply to kellyhensen

    Thanks, but I think I may have accidentally pointed the original requester back to the episode they referred to back at the start.   Oops !

    Re-reading, I think what they require is more of an interface that sits between the likes of Clem's external lens actuator motor and an off-the shelf camera Lanc controller.

    What may be of interest though is that Blackmagic Design now do a 'Zoom Demand' that has a USB C connection instead of the traditional Lanc jack that is designed to control micro four thirds format camera lenses from the likes of Panasonic and Olympus, which have motorised zoom capability.

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