The NiSi S6 PRO NC UV for S6 150mm Holder is designed for use with a NiSi S6 150mm filter holder system. It can screw into a NiSi S5 150mm filter holder adapter ring after the kit's included Pro Screw-In Circular Polarizer Filter has been removed. When in use, this filter absorbs ultraviolet light and reduce the bluish cast of daylight. Aside from the reduction of unwanted blue casts, no additional colouration or contrast is created, and adjustments to exposure are not required while using this filter. When the NiSi S6 PRO NC UV for S6 150mm Holder is used, 50% of ultraviolet light waves are absorbed in 395 nanometers, before which they are progressively eliminated, helping to limit the light that enters a camera to the visible spectrum. The appearance of blue casts that can occur while recording video or still photos under daylight that also features ultraviolet light is reduced, preserving colour accuracy throughout the frame. The NiSi S6 PRO NC UV for S6 150mm Holder filter is constructed from optical glass for increased clarity as well as colour fidelity while providing approximately 98.5% transmission of visible light. Our proprietary NiSi Pro Nano Coating helps to reduce unwanted reflections and provides a waterproof and scratch-resistant layer to assist in the cleaning of unwanted fingerprints, dust, and water stains. Please note if using this with an older generation S5 adaptor, the S6 holder frame must be used in combination.