I use it for Lightpainting and to photograph fireworks.
With fireworks I photograph with two bodysuits (2 Timer) and different focal lengths.
Once the cameras and timer set correctly, the number of pictures set, the second timer to start at the end of the shutter speed of the first bodysuits and it escapes no one rocket more.
One can look left fireworks and the cameras work by itself.
I do not want to miss the two timers!
Full buy recommendation