The Marumi Magnetic Filter Holder M100 is specially designed for use with the Marumi Magnetic Filters, which are available separately (see optional accessories). The Marumi Filter Holder M100 eliminates the need to purchase different filters per lens size. The magnetic frames ensure that you can easily attach the various filters to the filter holder. For high reliability, the Marumi Filter Holder M100 is made of aluminium. The foam gasket on the front of the holder ensures that no light is leaked. At the bottom of the filter holder there is a rotary knob, which allows you to use the circular polarization filter (also available separately). The polarization filter rotates independently of the filter holder. This Marumi Filter Holder M100 comes with standard adapter rings of 72mm, 77mm and 82mm. Using Step-up or Step-down rings, the holder can be made suitable for other lens diameters.