NiSi 100mm system filter holder kit-V5 PRO Standard CPL allows for the convenient use of up to three, separately-available 100mm-wide, 2mm-thick filters along with an included circular polarizer. This kit comes fully assembled and features an aluminum-alloy filter holder that is pre-installed with three pairs of plastic filter slots, a configuration that accommodates three rectangular filters. Each slot is designed to grip an installed filter only along the surface of the filter's edges. Contact with a filter's front or rear-facing surfaces is avoided, particularly when using graduated filters whose effect can be adjusted to better suit changing lighting conditions or creative demands by sliding them up or down within a filter slot.