The Lee SW150 System Adapter enables you to attach the Lee SW-150 Filter Holder to existing Lee Adaptor Rings. This means that you can use the SW150 filter holder on other lenses that you may have in addition to the Nikon 14-24mm lens it was initially designed for. Please note that this item cannot be used in conjunction with the SW150 Big & Little Stopper filters due to the necessary removal of the Light Shield during fitting