K&F Concept NANO-K 77mm Black Mist & CPL Filter Only used once. 【2-in-1】This 1/4 Black Mist & CPL filter is a multi-functional filter that combines a black mist filter with a soft effect and a C-PL filter with a circular polarizing function. It avoids vignetting when stacking two separate filters. (Note: Nano-Klear filters are non-HD lenses and cannot be used for telephoto shooting.) The exterior packaging may be a mix of old and new, but the contents are the same. 【Polarizing Effect & Reflection Removal】The filter removes reflections from non-metallic surfaces, making the sky more vivid and resulting in beautiful, vibrant photos. It is ideal for removing reflections when the subject and reflected light are at a 90-degree angle. 【Soft Effect & Contrast Reduction】It suppresses highlights and lifts shadows. It captures soft, diffused light in backlight, reduces contrast, and adjusts the difference between light and shadow to create a soft, cinematic atmosphere. It smooths skin by suppressing highlights while maintaining the resolution of the subject. 【18-Layer Coating】The filter is made of high-quality optical glass with an 18-layer coating on both sides, effectively reducing reflected light on the filter surface.