This is a KOKIN glass gradient ND4 filter. L size (Z-PRO series) square type, 100mm width Thickness: 2.3mm. It is thicker than standard 100mm wide filters, so it may not fit in some filter holders. There are some minor scratches, but I think it's within the range of practical use. Instant purchase OK, no price negotiation. ■ High-transmittance optical glass Uses high-transparency glass made by SCHOTT, a German optical glass manufacturer. Made by dissolving high-purity raw materials, it has high transmittance over a wide wavelength range from the visible to the infrared region. ■ Nano-level processing accuracy The glass surface maintains a parallel plane through high-precision optical polishing. With processing accuracy higher than resin filters, it minimizes the degradation of resolution. It can be used without reducing the performance of the latest cameras. ■ High neutrality Achieves excellent neutrality in the visible and near-infrared regions through unique special coating technology. No color cast even when multiple NUANCES filters are stacked. ■ Gentle gradation Conventionally, glass half NDs have excellent color accuracy, but it has been difficult to achieve a gentle gradation. However, NUANCES GND achieves a soft, stepless gradation with a special jig. ■ Special coating with high surface hardness and abrasion resistance While maintaining natural color reproduction as an ND, the scratch resistance of the coating surface is significantly improved. It is very resistant to friction, so it is less likely to be scratched during handling, and the ND effect can be maintained for a long time. ■ Low-reflection coating After applying the ND coating, low-reflection coating is applied to both sides of the glass to thoroughly suppress reflection. Half NDs are often used for shooting sunrises and sunsets, and low reflection is important in such shooting scenes because ghosts and flares are likely to occur due to the strong light of the sun. In addition, NUANCES GND has the same color tone of reflection from the transparent part to the ND part, suppressing changes in color tone during long exposures. ● 2-stop reduction ● W100 x H143.5mm