B073DR54KT Benro Master Lens Filter, Black (HF100)

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Multi-filter System – A CPOL and up to two additional 100mm filters can be used simultaneously.
Patented design enables rotation of the CPOL filter without having to first loosen or remove other filters or holder components. Scales provided for precise filter rotation and positioning.
Foam light baffles prevent stray light from entering open areas between filters.
Precision machined from aluminum alloy.
Scratch-resistant rubber-coatings.