David ICM = intentional camera movement. In this case rotating with the camera with a fairly long shutter speed thus the f32. In this case 1/4s with a 200mm lens @ISO32. It is normal to use a ND filter but I was shooting largely into the sun so I had to have the lens hood on ruling out my Lee filters. I must make a curious sight, rotating very quickly with a large and expensive camera pointed at the beach and sea. It takes a bit of practice to find the correct shutter speed to get enough detail and texture into the shot while keeping enough detail to allow some form of recognition and the keeper ratio is very low. If I get 1 in 20 I am delighted, sometimes all of the shots are complete rubbish and many people think that they are all complete rubbish. I often shoot the same image at different shutter speed to blend areas of lesser and greater detail in although I have not done it here. Out tonight along the Scottish Solway Coast, which is close, to try and get some more shots normal or ICM. I hope that this helps. Ken