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element14 presents Forum Universal LANC controller for DSLR cameras
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  • dslr
  • design challenge
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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.
Parents
  • mayermakes
    0 mayermakes over 2 years ago

    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 lenses and cinema primes is the amount of throw and force needed to move them. With a lot of lenses you will probably never get as perfectly smooth zoom as they do not behave linearly and have varried friction along the throw.
    But for a wide range it might be doable, the trickiest thing is to make asecure connection between lens and actuator. I got soem ideas, but it might be hard to pull off.

    I'll put it on the list for the next Element14presents season!

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  • mayermakes
    0 mayermakes over 2 years ago

    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 lenses and cinema primes is the amount of throw and force needed to move them. With a lot of lenses you will probably never get as perfectly smooth zoom as they do not behave linearly and have varried friction along the throw.
    But for a wide range it might be doable, the trickiest thing is to make asecure connection between lens and actuator. I got soem ideas, but it might be hard to pull off.

    I'll put it on the list for the next Element14presents season!

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

    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 on one side and an idler pulley on the other side to tension it whilst keeping the loading central on the lens. It could potentially accommodate different lens diameters as well as if the axis of the drive pulley/idler is kept central to the axis of the lens mount, then you can change the size of the drive belt to match the diameter of the lens ring.

    Non-linearity for zoom could perhaps be improved using a lookup table to profile the lens. Might be possible to automate this using a test chart and capturing the image in order to map the non-linearity over the range from wide to tele.

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

    I have just seen this simple design which appears to produce good results on a gesture-controlled camera rig. May be of interest.

    image image

    "...The zoom rig is even simpler. It uses a small timing belt wrapped around the zoom ring and a small MDF gear directly on the stepper motor's axle..."

    Pave Demos | Tangible Semantics - Controlling Devices With Your Hands
    https://www.youtube.com/watch?v=uXg5oKD287A

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

    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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