The W1245-Schott NG-3 4″ dia × 0.079″ thick optical wafer is precision-manufactured from high-quality Schott NG-3 neutral density glass, offering nearly uniform light attenuation across the visible spectrum and excellent optical performance for precision imaging, laser, metrology, and machine-vision applications. This 101.6 mm diameter, thin, finely ground, and polished wafer features a 90 % clear aperture, controlled reflective wavefront error, and fine surface cosmetics, making it ideal for demanding engineering and research environments where consistent optical characteristics and dimensional accuracy are required.