This timing circuit outputs 5 volt pulses to the USB ports of Canon PowerShot cameras to synchronize the release of their shutters. When the remote function of CHDK is running on both cameras, the start of a pulse to the USB ports activates a "half press" of the shutter button and all automatic focusing, exposure, etc is done. When the pulse ends, the shutters of both cameras operate simultaneously to take perfectly synchronized photos. The timer allows adjusting both the interval between pulses (2.5 to 60 seconds) and the duration of the pulses (0.5 and 5 seconds). An indicator LED is lit during the pulse.
This timer allows two-camera infrared systems to take synchronous pairs of normal and near-infrared photos for combining into false color IR or NDVI images. This is the timer included in all Titan 2 IR packages here. Synchrony is critical when the cameras are moving if the photo pair must be aligned to make a composite image.
Includes timer, 3D printed enclosure, battery box with on/off switch (for four alkaline AAA, not included), two Mini-B USB cables, two Velcro ties, Velcro tape, and the MK111 assembly and specification sheet. Completely assembled and tested. Total weight with batteries is 125 grams.
The timer is an MK111 timer (based on the 555 IC) which has been modified to operate on low power. Instead of operating an electromagnetic relay which switches a separate power source to the devices (the cameras), the relay was eliminated and the same batteries that power the timer also power the cameras. Any six volt source can power the device, so the very small 4LR44 battery will work. Alkaline AAA batteries are easier to find and four of them will power the timer for many hours.
More information is available in the guide for the build-your-own Shutter Timer Kit at the Guides page.
How to use the timer with two Canon PowerShots