The spares kit contains a complete set of spare screws and attachments for the 100mm Holder system.
A holder system allows you to purchase one set of filters to fit all of your lenses. An inexpensive adapter ring is then used to fit the different thread diameters of your individual lenses. The holder system is quickly and easily removed allowing you to quickly compose your image, then gently install the holder before taking the photograph without the fear of altering the framing or focus. Holders allow filter stacking, plus rotation of horizon and vertical adjustment of graduated filters. Polarizers work with holder systems using an optional adapter ring.
