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. usage marumi magnetic filter holder m100 attach the circular polarizing filter to the adapter ring and screw the adapter ring to the camera lens. finally, attach the marumi filter holder m100. you can now easily and quickly change the different magnetic filters for immediate use. the holder then grabs the filter firmly, so that no vignetting occurs. you can stack a total of three filters to the filter holder m100, which can be easily adjusted in height by the magnetic strip.