GENUINE NiSi 77mm SLIM PRO NANO GND 16(1.2) Graduated Neutral Density Filter H-K9L Glass 4-Stops
Nano coating optical gradient filter. It's made from environmental optical glass (H-K9L).
The glass is find annealing environmental protection optical glass H-K9L. Double sides
optical grinding and polishing to make sure the optical high parallelism and smooth which ensure the high sharpness of image. Neutral density filter coated on double sides via 200 C high temperature coating. The spectrum curves and straight and flat. It's soft transition from visible light to infrared light. There is anti-electrostatic coating can resit dust and also can endure wipe off organic solvent. AR and water-proof coating on double sides make the filter won't fade after several years.
Optical glass (H-K9L)
Low color cast
Ultra low reflection