The Cokin P Series Filter Holder accepts Cokin's 84x100mm P filters and is suitable for larger diameter lenses up to 82mm, with a focal length from 28mm onwards (35mm format). The holder features three slots for holding up to three filters to create a unique effect. Simply attach the filter holder to your lens using an adapter ring (not included) and slide your 84mm wide filter into the holder. Note: An adapter ring (not included, available separately) is required to allow attachment to your lens. Adapter rings are available in various thread sizes from 48mm to 82mm, please check the diameter of your lens to work out what size adapter ring you need.