Hmmm, I can see that the flash will be useful to control the lighting on the model. But surely if she is lit by the same ambient light as the waterfall then she will be just as exposed as the waterfall by the long exposure (and therefore subject to blur).
The flash will 'fill in' and help with making the model stand out but how will it freeze her ?
The only way that the freezing effect of the flash will come into play and be useful is if you expose the background to say -3 or -4 stops and use the flash to bring out the model.
The flash will 'fill in' and help with making the model stand out but how will it freeze her ?
The only way that the freezing effect of the flash will come into play and be useful is if you expose the background to say -3 or -4 stops and use the flash to bring out the model.