absorption-type neutral density optical filter devised for precise light attenuation in the 400-700nm wavelength range. Constructed from premium optical glass with a surface rating of 60-40, ensuring minimal distortion and optimal clarity. Compact size of 50mm x 50mm, perfect for various optical applications including photography, microscopy, and scientific experiments. Transmittance range from 0.0001% to 90%, allowing for versatile use in controlling light exposure and protecting sensitive optical components. Dimensional and thickness tolerances of ±0.1mm and ±0.05mm respectively, guaranteeing a reliable fit and consistent performance in your optical setups.