I'm trying to get a cokin nd grad. I've heard that a 2 stop grad is the most useful, but I can't seem to find one anywhere. Would the 1 stop extra on a 3 stop grad make much difference, as I can find plenty of these. I'm mostly going to be using the grads for sunrises and sunsets. As for hard and soft grads, none of the ones I've seen on websites actually say whether they are hard or soft, how can I tell? If you can help me out, I'd be very grateful EDIT: I've found some kood filters, but instead of their strength it says dark grey etc. If anyone owns any of these, which one is most commonly used and what are they equivalent to in terms of f stops.