Documentation images for the Kotokino Mark IV scanner

I was asked to provide more detailed images of the Kotokino Mark IV telecine machine, so I shot a dozen more.

General setup. The lamp is housed inside the box, which is built out of floor laminate, with 3D printed corners. The camera is a placeholder for my usual Canon 1000D.
Other view showing the film takeup spool and the servos, one for the spool, and one for the film gate rotation.
Top view showing the relative layout of the parts. Note the gray assembly that allows three axis movement for the film gate switch.
Film entry side of the device. The film trough is printed to have just an adequate light aperture to allow for frame capture but no leakage of light.
Film trough with a frame visible, illuminated from below.
Closeup of the camera tower assembly with the adjustment screws visible.
Power management with 12V/ 2A going in, and then four buck down regulators splitting it into 5V for Arduino, 6V for servos, 8.7V for camera and 12V for light.
Arduino on the right, four switches for each of the constituent parts, and the buck downs in a single element. The potentiometer is for adjusting takeup spool speed and turning it the other way when rewinding.
Takeup spool is located after the film gate. The film movement is governed by the film gate, which can be moved to allow for frame adjustment under the camera.
Closeup of the film gate switch, which closes the circuit to trigger the camera when a frame is in place.
The film gate switch is closed in this image.
The salvaged film gate from a ruined Bolex D8 is the heart of the entire telecine machine. You can se ethe film advance pin close to the blue shrink tube which holds the switch actuator rod.
Closeup of the power delivery box, the Arduino Nano on the left.
Arduino Nano
The lamp inside the housing.

So, this set of images is mainly for the benefit of those who may want to build a similar setup. If you have any more questions, just drop me a comment.


0 thoughts on “Documentation images for the Kotokino Mark IV scanner”

  1. Hi. I’m seriously thinking about making one of these, but there are many things I don’t fully understand.
    1. Could you make some pictures about how the film gate switch (the green motor) works? Specially how the circular motion gets translated into the back-forth motion. I can’t understand it with the videos. Also how can I substitute the salvaged film gate you have there?
    On this schematic, you use a breadboard, but there is something else in this post pictures. How exactly does it work here?
    3. How does the power come from, a set of batteries or from a power socket?
    4. How do you make the camera to never run out of battery?
    5. Are there any more schematics about this latest model?

    I’m not really into this level of electronics, but I would love to try it. I just have this doubts that push me from spending the money to make it.

  2. Hi, I love the project and I am thinking about doing it on my own (although I’m not that skilled), but I have many doubts that are stopping me to spend the money to actually do it.
    1. I understand that you used an old film gate from another camera. How could you replace it? Like, any other way to make it?
    2. Is it connected to an electric socket? or does it run in Batteries?
    3. How do you make the camera not running out of electricity?
    4. You use a different Breadboard that in the schematics you showed here:
    Could it be possible to get new schematics?
    5. Could it be possible to get more info about how to build it (videos, pictures, instructions…)?

    I really wanna try it, but I wanna make sure I understand everything before I dare put money into the project.

    1. Hi! Thanks for your comments, sorry for being a little late in replying. I try to answer both your comments here.

      The film gate is actually the only feasible solution I have found for the movement of the film. The film moves at an increment of 5 mm and managing that in any other way was way harder than buying a broken camera and taking the film gate from there. This ensures the film moves exactly as it does in the camera. The circular motion of the servo is changed into a back and forth motion by an eccentric cam, and the film is pushed along by a pin in the film gate arm. The broken camera cost me 8 euros on eBay, so it isn’t much of a cost.

      I am not using a breadboard anymore, the image was just to illustrate the connection. I am putting in 12 volts, which is then lead into four buck down regulators to divide it into 5V for Arduino, 6V for servos, 7.8V for camera and 12 volts for the lamp- Frim the regulators, the volgates are merely wired to the respective devices.

      The camera has a 3D printed battery replacement, as it cannot take more than 700 images on battery. This is not provided in the printable files because people use various camera types.

      This is really a rather simple device, but when I get back to the office, I will make a video to show you the various parts. The code works as it is provided now.

      Thanks again for your interest in Kotokino Mark IV!

      1. Thanks! I would really appreciate the extra info! Again, I am willing to spend the time and money for this, but I want to be as secure of myself as possible before making the first step.

  3. So… I’m officially trying this project. I’m buying all the stuff, so there is no backing up now. I have some more questions about it though, is there any way I can message you in a private way, so that I won’t fill this comment section with my questions?

    1. Hi! I am thrilled you are trying to replicate this. You can mail me at my dot name at sabulo dot com.

  4. Hello,
    I would like to thank you for all the posts you shared on this project.
    Thanks to you, I was able to finalise my own film scanner and I also wrote a complete tutorial. Of course, your name and a link to this website are in the credits.
    The tutorial is available here:
    This version is compatible with 16mm, 8mm and with Super 8 and has a fully automatic rewind mechanism working with an IR sensor.
    Thanks again for your help.
    Best regards,

  5. Hi there. First of all, congrats for this project, its absolutly amazing.
    Im going try to make one..
    Do you have any electronic parts list to share? i didnt find information about Servo models, etc.
    Thank very much

    1. Thanks for the comment!

      The parts list is really small.

      • Arduino
      • 2 servos, of the 360 degree rotation type
      • four buck down regulators
      • a broken camera to provide the film gate part
      • a LED rated at a color temperature that suits your camera
      • a microswitch and four small switches
      • potentiometer for the speed control

      That’s about it. Keep me posted on how it’s going, and also see this tutorial which may be of use to you.

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