I have an idea where a card would be thrown towards the camera and I would use a small aperture so that the thrower is only just out of focus and the card will be in focus. This means that I will have to use a fast shutter speed and I'll have to get perfect timing. An alternative is to use an infrared delayed camera trigger.
These transmit an IR beam that when broken it will trigger the shutter, the delay time should be adjustable so that all the subjects are in frame. The high end models have an adjustable beam area coverage and they also respond to other elements like sound, movement and light. The light sensor is similar to the slave setting on a flashgun. There are many videos and tutorials that can teach someone how to make an IR trigger using an Arduino, micro chips and resistors to adjust the delay time.
However I will attempt to get the image without a delay trigger first so save the hassle of making one or buying one.
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