Mounted within a nonthreaded aluminum alloy ring, a Haida Magnetic Filter for the Haida M15 Filter Holder is made specifically to fit between the included Haida M15 Filter Holder and an 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.
After being fitted onto an adapter ring, the filter holder's pull-and-release locking knob helps provide a reliable yet adjustable connection that allows the holder to rotate 360°, benefiting the use of rectangular graduated neutral density or other filters enhanced by varied positioning.