Multi-day moving time-lapse

time lapse dolly

This project was a collaborative effort between Peter Kerwin, Joshua VP and Brian Grabski, with special thanks to Kyle Pettis for loaning us his beautiful copy of Rembrandt’s Lucreacia.

 How we pulled this shot off:

  1. To keep the lighting consistent, we covered all of the windows with tin foil.  We had several “day light” fluorescent bulbs set up on stands that provided consistent lighting throughout the two weeks the flowers were blooming.  That lighting setup works great for multi-day shots because the fluorescent bulbs stay cool.
  2. The camera is controlled by an intervalometer.  Each time the camera takes a picture, a red LED light on the back of the camera illuminates.  This light lets you know that the shutter is open.  (For this shot, we took 3-bracketed images every third minute.)
  3. An Arduino Duemilanove controls the whole operation. We taped a photoresistor (a simple light sensor) over the camera’s LED light. The photoresistor reacts to the light emitted from the LED, and creates a signal that the Arduino board can measure when the LED turns on. Each time the camera’s shutter opens while capturing an image, the Arduino board knows it.
  4. As soon as the Arduino board receives the signal that a photo has been taken, we programmed it to wait for 60 seconds–this delay was added to ensure that the dolly will not move while the shutter is open for long exposures. After receiving the signal from the camera and waiting, the Arduino board activates a high capacity H-bridge called a Spike for five seconds.
  5. The Spike then powers a 2 RPM gear motor connected to the winch. The winch either pulls or lowers the dolly up or down the curved pipe tracks, which are mounted on top of fully adjustable saw horses. The gear motor runs at a fixed speed, so the duration of its runtime determines how far the dolly will move between shots.
  6. The robotic control of the dolly manages two variables: the frequency of the shots (set by the intervalometer) and the distance covered by the dolly between each shot (set by the Arduino board). Because the track length is fixed and the runtime of the gear motor determines the distance the dolly moves between shots, the run time essentially dictates how many images the camera will take while traversing the track. A consistent number of images means that the length of the final video will depend only on the runtime of the winch. Thus if we want to create a 10 second time lapse with shots covering three hours or ten days, we only need to adjust the intervalometer. This greatly simplifies the field programming of the dolly.

 

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Comments

3 Responses to “Multi-day moving time-lapse”
  1. Gary says:

    Hi there just watch your time laps video.
    Fantastic job everyone. What a lot of work you guys have done.
    The above comment is correct in saying it was nice to see not only the lilies
    but rolling forward on the made dolly and all your hard work designing and figuring
    everything out. My gosh fantastic and very interesting read of all of this.
    I wish I knew how to get a set up like that going for myself wow.
    I bought myself a canon 7d and I am hoping to try an experiment in time laps
    photography in the future. Keep up the great work. Wonderful.
    What’s the next project for you to do ? Cant wait to see.

    Kind Regards Gary

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  1. [...] It’s neat to watch these lilies open and close during the time-lapse movie. But what makes it even better is to see the camera slowly move during the time-lapse event. It’s thanks to a special dolly which the photographers built for this purpose. [...]



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