This is my answer to the challenge which was set for me by @salza to use slow shutter speed in a photograph. I have had all sorts of problems with this because everything I took was over-exposed. What I really needed was an nd filter but I only have nd grads.
In the end I used two nd grads with one of them turned the wrong way round and the graduated bits in the middle overlapping. Not perfect, but at least I got something.
