NiSi Cinema 4x5.65 Linear Polarizer Filter

The NiSi Cinema 4x5.65" Linear Polarizer is built for professional film and video production, where controlling reflections and enhancing color saturation are everyday requirements. Sized to fit standard cinema matte boxes, this filter reduces glare from non-metallic surfaces such as water, glass, and foliage, while simultaneously deepening blues in skies and boosting overall tonal richness. Its linear polarization design is intentional — cinema cameras overwhelmingly use contrast-detection autofocus or manual focus, so there is no need for the circular polarization that still cameras require, and the linear configuration provides stronger, more predictable polarization performance.

Constructed from optical glass, the filter maintains edge-to-edge sharpness without introducing distortion. The filter factor of 2 to 2.8x (1 to 1.5 stops) is relatively light, meaning it can be used without dramatically altering exposure settings — a practical advantage when shooting in changing light conditions. NiSi has chosen to leave this filter uncoated, which keeps the color rendering neutral but means shooters working with strong backlight or point light sources should be mindful of potential flare. For narrative filmmakers, documentarians, and commercial videographers, this filter is a fundamental piece of kit that addresses one of the most common visual challenges on set.