Firing multiple cameras at the same time

Part of an array of 120 Canon EOS 30D cameras controlled using 5 laptops running
DSLR Remote Pro Multi-Camera


There are two ways multiple cameras can be fired at the same time using DSLR Remote Pro Multi-Camera which are described below. In order to eliminate variable delays due to auto-focus the cameras should be set to manual focus and pre-focused before taking the photos.

With PSRemote Multi-Camera it is only possible to trigger the cameras using the first method. To minimize variations due to auto-focus delays the cameras should be pre-focused by selecting AF lock in the main PSRemote Multi-Camera window. Using AF lock you can usually synchronise multiple Canon PowerShot cameras to within less than 1 ms.

  1. Using DSLR Remote Pro to trigger the cameras:
    This can be done by selecting "Gang camera shutter releases together" in preferences and then pressing the "Release" button in the main window. DSLR Remote Pro instructs each camera to take a picture as quickly as possible and each camera will be triggered in turn with a delay of approximately 1/6 sec between each camera. This means if there are 18 cameras it will take approximately 3 secs from when the first camera takes a picture until the last camera takes a picture.
    When capturing video the cameras will start one after the other with a delay of approximately 1/10th sec between each camera. Better video synchronization can be achieved using Canon EOS-1D C, Canon EOS-1D X and Canon EOS 5D Mark III cameras by triggering them using the remote release connection.
  2. Triggering the cameras using the remote release connection:
    Canon EOS cameras have remote release sockets which allow the camera to be fired by simply using a switch. Multiple cameras can be fired at the same time by plugging cables into the remote release socket of each camera and witing these together to a master switch. The cameras won't all trigger at exactly the same time due to variations in the response time of each camera but they will usually all fire within approximately 1 ms to 5 ms of each other (the variation depends on camera model, lens type etc.). This variation can be reduced by activating the auto-focus via the remote release cables just before taking the photo.
    This technique can also be used to start and stop video capture when using Canon EOS-1D C, Canon EOS-1D X or Canon EOS 5D Mark III cameras. To enable this the cameras need to be setup so that the shutter release button is configured to start/stop video capture (please see the camera instruction manual for details on how to set this up). The 5D Mark III must also be set to movie mode by setting the movie/camera switch to the movie position.

Using the remote release socket to fire multiple cameras at once

The remote release sockets on all EOS cameras are either a proprietary three-pin socket (higher end camera models) or a simpler standard 2.5mm jackplug with three connections. Both socket types work in exactly the same way and provide a way of remotely sending shutter elease half and full press suignals to the camera. Remote release switches and cables can be bought as accessories from Canon or more cheaply from eBay.

The remote release switch has two positions similar to the camera's shutter release button. Half-pressure on the release switch activates the camera's auto-focus by connecting the "Ground" and "Activate AF" pins together. Full pressure on the release switch releases the camera's shutter by connecting the "Ground" and "Release Shutter" pins together. It isn't necessary to activate the auto-focus in order to release the shutter and a picture can be taken by only connecting the "Ground" and "Release Shutter" pins together. Activating the auto-focus releasing the shutter puts the camera into a heightened state of readiness and will reduce the variations between cameras.

Canon EOS-1D C, EOS-1D X, EOS-1Ds Mark III/EOS-1D Mark IV/EOS-1D Mark III/5D Mark III/5D Mark II/6D/7D/50D/40D/30D Remote Release Connector

Canon EOS 30D connectors (remote release socket is bottom left)

Remote release socket for Canon EOS 30D/40D/50D/6D/7D/5D Mark III/5D Mark III/5D Mark II/1D Mark III/1D Mark IV/1Ds Mark III/1D X/1D C showing pinout

Canon EOS 70D, 60D, 400D/Digital Rebel XTi, 450D/Digital Rebel XSi, Canon EOS 500D/Rebel T1i, Canon EOS 550D/Rebel T2i, Canon EOS 600D/Rebel T3i, Canon EOS 650D/Rebel T4i, Canon EOS 700D/Rebel T5i, Canon EOS 100D/Rebel SL1, Canon EOS 1200D/Rebel T5, Canon EOS 1100D/Rebel T3 and Canon EOS 1000D/Rebel XS Remote Release Connector

Canon EOS 70D, 60D, 700D/ Rebel T5i 650D/ Rebel T4i, 600D/ Rebel T3i, 550D/Rebel T2i, 500D/Rebel T1i, 450D/Digital Rebel XSi, 400D/ Rebel XTi, 100D/Rebel SL1, 1200D/Rebel T5, 1100D/Rebel T3 and 1000D/Rebel XS Connectors (the 2.5mm jackplug soket in the middle is the remote release socket)

2.5mm 3-connection Jackplug for the above cameras.

Triggering all the cameras at the same time

The simplest way to trigger all the cameras at the same time (to within a few milliseconds of each other) is to use a simple passive trigger system like the one shown below:

This type of trigger can be used to trigger up to 50 cameras. If you need to trigger more than 50 cameras or do not wish to make your own trigger you can use a commercial unit such as the ShutterCell from Esper Design. The ShutterCell is a high quality unit which can trigger up to 16 cameras. Multiple units can be linked with standard Cat5 cable to trigger larger numbers of cameras. Please vist Esper Design's website for more information about the ShutterCell.

ShutterCell 16 camera trigger system from Esper Design

More sophisticated ways to trigger cameras

If you need a more sophisticated trigger system, e.g. triggering each in sequence camera with a delay between each camera, you will need to use a sequencer or a microprocessor controlled trigger. We don't know of any commercially available triggers of this type at the moment, but we are in contact with one company that is developing one and will provide more information here when it is available.

The diagram below shows how a microprocessor can trigger cameras using opto-isolators:

Typical Setups

A typical setup to control and trigger 16 Canon EOS cameras from a single PC would consist of:

  1. A PC or laptop running Windows 7 or Windows 8 and our DSLR Remote Pro Multi-Camera software
  2. A 4 port USB hub connected to one USB port on the PC with a further four 4 port USB hubs connected to each of its ports. The USB cables from the cameras plug directly into the USB ports on the USB hubs. The USB hubs should be externally powered for maximum reliability.
  3. A camera trigger system such as the simple passive trigger, above, or a commercial trigger such as the ShutterCell. The trigger is connected to the remote release sockets of the cameras and usually has a handheld remote release switch to trigger the cameras.

Most modern laptops can control up to 32 cameras using this type of setup. Desktop PCs can often control more cameras e.g. up to 70 cameras. For larger arrays of cameras you can use multiple computers networked together, each running a copy of DSLR Remote Pro Multi-Camera. Please see this section of the DSLR Remote Pro Multi-Camera help file for more information.

Please note: The maximum USB cable length allowed by the USB standard is 5m (approx 16 feet). This can be extended by using USB hubs but you are only allowed a maximum of 3 hubs daisy chained together (giving a maximum cable length of 20m). You can buy active USB cables which can be daisy chained together but please be aware that these are really cables with a self-powered USB hub on the end. Self-powered USB hubs draw power from the USB interface instead of using an external power supply and tend to be less reliable than externally powered hubs.

In operation DSLR Remote Pro Multi-Camera is used to control the camera settings and manage the downloading and naming of the images and the trigger system is used to trigger the cameras.

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DSLR Remote Pro Multi-Camera - Remote Capture Software for controlling multiple Canon EOS-1Ds Mark III, EOS-1D Mark III, EOS 7D, EOS 60D, EOS 50D, EOS 40D, EOS 30D, EOS 400D/Rebel XTi, EOS 450D/Rebel XSi, EOS 500D/Rebel T1i, EOS 550D/Rebel T2i, EOS 600D/Rebel T3i, EOS 650D/Rebel T4i, EOS 1000D/Rebel T3 or EOS 1000D/Rebel XS cameras