The Cokin B2 Full Transition 2-stop Graduated Tobacco filter is like having two filters in one. The filter starts with a 2 -stop Tobacco grad on one edge and transitions across the whole filter to 1-stop Tobacco grad at the opposite edge. This creates a base of 1-stop of total light reduction across the whole image then provides and additional 1 -stop graduated ND starting at the top of the filter. This is great for scenes that require a total light reduction but also requires brighter areas, like skies, to be enhanced further.