Sometimes I like the effect of long exposures on my seascapes. The two images below have been captured with a Nikon D700 camera and the Nikon 24-120mm. For both images I used a 10 stop ND Neutral Density filter to allow me to use a longer time for the shutter to remain open.
The 10 stop ND filters are very dense I I find it almost impossible to focus the camera with the filter on the camera. I use the filter by switching the camera to manual focus and also setting the exposure without the filter to the manual setting, then make the allowance for the 10 stops by changing the aperture ( increasing the aperture from f/5.6 in this case to f/16) and extending the shutter speed by a total of 10 stops, which was 20 seconds in these images.
The above image was exposed at f/16, 20 seconds at ISO100 and the below image also at the same settings. For images such as these, a tripod is essential and also a remote shutter release to avoid camera shake.
I really like the effect on the blurred water with this type of slow shutter speed image.
The equipment I currently use for my photography is as follows: