High-quality 49mm PRO Nano Round 3-Stop IRND8 Filter from reputable brand NiSi Ultra-thin, durable aluminum frame for lightweight and reliable use Advanced nano-coating technology ensures waterproof, oil-resistant & scratch-resistant properties Variable density of 0.9 for precise control over light intake, enhancing image quality Matched filter threads on both faces for easy mounting and filter stacking Ideal for landscape and portrait photography, allowing for creative experimentation with wider apertures and faster shutter speeds