Using external flash or studio strobes with live view
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Due to the way Canon have designed live view on their cameras the triggering of flash guns and studio strobes can cause problems. Some options for lighting a photo booth are outlined below:
Option 1: Use an E-TTL II compatible flash connected to the camera's hotshoe. This should work for all mid to high end cameras. The camera's live view exposure simulation should disabled otherwise the live view images may be too dark. This doesn't work very well with low end camera models because they initially disable live view exposure simulation automatically but then turn it back on again after a few seconds.
Option 2: Use a flash which is not E-TTL II compatible or studio strobes connected using a hotshoe to PC cord adapter. This should work for mid to high end camera models if the camera's live view silent shooting setting is disabled and live view exposure simulation is disabled. This also works with mirrorless cameras (e.g. Canon EOS M50) if exposure simulation is disabled. For low end camera models the "external flash" option needs to be selected.
Option 3: Use the camera's built-in flash to trigger the main flash or strobe via a slave unit. This should work for mid to high end camera models if the camera's built-in flash is set to manual flash not E-TTL II. If the flash is set to E-TTL II the camera fires a pre-flash which will trigger the main lighting prematurely. The flash mode on low end camera models cannot be changed and is set to E-TTL II which means you will always get a pre-flash. However, this method should work with low end camera models if you use a slave unit which has pre-flash cancellation so that it ignores the pre-flash and only triggers off the main flash.
Option 4: Use the camera's built-in flash. This should work with all camera models but may result in result in rather harsh, unflattering lighting.
Option 5: Use continuous lighting or available light to avoid the need for flash. This will work with all camera models but may cause problems if the available light is too dim or keeps changing.
Mid to high end camera models: 40D, 50D, 60D, 70D, 80D, 6D Mark II, 6D, 7D, 7D Mark II, 5D Mark IV, 5D Mark III, 5D Mark II, 1D Mark III, 1D Mark IV, 1Ds Mark III, 1D X, 1D X Mark II, 1D C
Low end camera models: 200D/Rebel SL2, 100D/Rebel SL1, 2000D/Rebel T7, 4000D, 1300D/Rebel T6, 1200D/Rebel T5, 1100D/Rebel T3, 1000D/Rebel XS, 77D, 800D/Rebel T7i, 760D/Rebel T6s, 750D/Rebel T6i, 700D/Rebel T5i, 650D/Rebel T4i, 600D/Rebel T3i, 550D/Rebel T2i, 500D/Rebel T1i, 450D/Rebel XSi
Mirrorless camera models: Canon EOS M50