This Haida M15 Filter Holder allows for the convenient use of up to three separately available 150mm wide, 2mm thick filters along with a separately available Haida Magnetic Filter for the Haida M15 Filter Holder. Mounted within a nonthreaded aluminum alloy ring, a Haida Magnetic Filter for the Haida M15 Filter Holder is made specifically to fit between the Haida M15 Filter Holder and a separately available adapter ring for the filter holder. For filters such as a Haida Magnetic Circular Polarizer, the filter holder's external dial integrates with the filter ring, allowing for the independent rotation and adjustment of those filter types.