I want to develop a collection of neutral density grads for colour work with slide film. Due to resources (or lack of!) I will need to build my collection up one or two at a time. So I wondered which ones are the most commonly used by APUG'ers in terms of: a) hard or soft graduation b) 1 stop, two stop or three stop densities Basically I shoot gentle landscapes in the UK (rolling hills etc) on velvia in medium format - but I do not shoot many early sunrises or late sunsets. Any advice on where to begin much appreciated.