A rectangular ND filter with a density ND64 (6 stops) 4mm thickness size is 4 x 5.65 inches and can be used for various mat boxes etc.
Made with high quality SCHOTT (Shot) B270 glass. The visible light transmittance is very high, and the ultra-precision polishing ensures high flatness accuracy on both sides.
The coating on both sides is oil-proof, waterproof, and dust-proof, so you can quickly wipe the oil and dirt on your hands with a soft cloth to remove stress-free photography. In addition, it has excellent antistatic properties, and prevents dust and other adhesion.