How to Build Your Own 3D Camera Rig for Under $20
How Does Stereoscopic 3D Photography Work?
Stereoscopic 3-D photography has been around almost as long as photography itself. In the 1830s Sir Charles Wheatstone theorized that we see the world in three dimensions because our eyes are set about 2.5 inches apart, and see from two slightly different viewpoints. You can test this by holding your thumb at arms length. Close one eye and look at your thumb, then look with just the other eye, and you will see that there is a deviation, or parallax, between what your eyes see. Your brain fuses these two views together, interpreting the amounts of parallax as depth. This is called binocular stereopsis.
Wheatstone figured out that two cameras could be placed side-by-side and take simultaneous pictures, creating a pair of photographs from both left eye and right eye perspectives. When viewed through a stereoscope, the left eye only sees the left image, the right eye only sees the right image, and we perceive a single 3-D view.

The author's 3D photos from Comic-Con
Throughout the late 19th and early 20th centuries, stereo photos were all the rage, with many thousands of stereo cards produced. In fact, many Victorian era homes kept a stereoscope as the centerpiece of their living rooms - sort of the entertainment center of the day. Still, the process of making 3-D images was very complicated, as it was necessary to have two synchronized cameras to take the pictures, and quite a bit of skill to align and mount the finished prints or slides for viewing. Over the years, a number of film cameras have been made with dual optics and shutters, specifically for stereography, but these still require a great deal of meticulous work by the photographer in order to properly align pictures for display.
Do-It-Yourself 3D
The 21st century has seen a resurgence in the popularity of stereography, or 3D imagery, and thanks to the availability of inexpensive digital cameras and photo-processing software, do-it-yourself 3D imagery is now possible.
The simplest method for taking a 3D photo requires just a single camera, and a stationary subject. Place your feet firmly on the ground, with your weight on your left foot, and take a picture. Shift your weight to your right foot and take a second picture. You now have a stereo pair of images, one for the left eye and one for the right eye, which can be viewed in 3D. Obviously, this technique, called “sidestep” or “cha-cha” 3D, only works for subjects that are not in motion.
To take stereographs of dynamic subjects, we will need to take two photos at exactly the same time. Japanese camera manufacturer Fuji recently released the first digital camera equipped with two lenses for 3D. Of course, for the technologically savvy, you can make your own 3D camera rig using common building materials and two digital cameras.
For this project, we’ll use a pair of matching Canon PowerShot cameras and specialized synchronization software called StereoData Maker, or SDM, which is a nonvolatile firmware upgrade based on CHDK, the Canon Hack Development Kit. SDM adds a set of features to certain Canon cameras, specifically for the taking of 3D pictures.
What You Need
- Two Canon PowerShot cameras compatible with SDM (Buy them here)
- Two 4GB SD cards
- Two right-angle metal brace clips
- Two tripod screws or 1/4-inch thumbscrews
- Cloth tape or sturdy electrical tape
- Metal washers
- Two USB cables
- Altoids tin
- Push-button switch (Buy them here)
- Two female USB connectors
- Battery holder
- Three 1.5V AAA batteries
- Hot-glue gun
- A Dremel tool
- Red/cyan 3D glasses (Buy them here)
Aside from the digital cameras and tools, the core components of the rig won't cost you more than $20! Now it's time to assemble the pieces.