B+W Filter Master Line Graduated 713 GND 0.9 ND 82mm 1107813Connection of sky and earthND Graduated filters are half transparent and offer a graduated ND grey filter effect on the other half. They allow you to selectively balance the contrast between sky and landscape - for example, to bring out clouds impressively. To make it easier for you to work with the filters, they can be rotated in the filter holder.