Hi Paul,
You can actually use the lens in any position out of the "0" position all the way to "3".
Its not neccesarary that you use the preset 1,2,3 position.
I really love the soft focus effect of the lens. At "0" ohh.....its sharp too. COlors are vibrant and bright.....i like it.
I think TK have 2 - if you got one form them than they might have one more.
rgds,
sulhan