The NiSi True Color CPL (Brass Frame) is designed to reduce glare and reflections from non-metallic surfaces while enhancing the saturation and vibrancy of skies, foliage, and water, all while maintaining true color accuracy. Unlike many circular polarizers that introduce a warm or yellow color cast, NiSi's True Color polarizing technology preserves the natural color balance of your scene, delivering images that require less color correction in post-processing.The precision-milled matte black brass frame offers exceptional durability and smoother threading than aluminum, making the filter easier to install and remove while helping prevent binding on your lens. Its slim profile helps reduce the risk of vignetting on wide-angle lenses, while the knurled outer ring provides a secure grip for easy handling, even in cold or wet conditions.A removable knurled adjustment knob attaches to the rotating ring, allowing for quick, precise control when adjusting the polarization effect. The knob can be removed in seconds whenever a lower-profile setup is preferred or when stacking additional filters.A Circular Polarizer (CPL) filter reduces reflections and glare by filtering polarized light reflected from non-metallic surfaces such as water, glass, painted objects, and foliage. This allows your camera to capture richer colors, deeper blue skies, improved cloud contrast, and greater detail beneath the surface of shallow water while minimizing distracting reflections.Constructed with high-quality optical glass, the filter maintains outstanding sharpness and clarity for today's high-resolution cameras. NiSi's Pro Nano multi-layer coating reduces flare and ghosting while providing a waterproof, oil-resistant, scratch-resistant surface that repels dust and fingerprints for easier cleaning in the field.Please note: Due to the design of this filter, it is not compatible with all lens hoods.