not really. one you setup your tripod there, you are already focusing on the light house... and then when a wave is crashing in, you just hold down the shutter

not really. one you setup your tripod there, you are already focusing on the light house... and then when a wave is crashing in, you just hold down the shutter for a few burst shots... very easy to replicate the same shot... say if it was a photo group... then the chance of same shot being outputted is even greater