SIGMAKOKI Reflective step-type ND filter

By using ND filters with evenly spaced optical densities, the amount of transmitted light can be changed stepwise. It can be used for calibrating densitometers and colorimeters. 11 evenly spaced optical densities are arranged on one piece of glass, so you can find the rough optical density value of an unknown optical density sample by visual comparison. Since it is chrome coated, it can also be used to adjust the amount of light of a laser beam. Since it is chrome coated, the optical density does not change even if the wavelength changes in the visible light range. *The range with uniform transmittance is 4.6 x 25 mm. *Please use with beams of Φ3 mm or less. *The transmittance changes logarithmically with respect to the amount of movement. *It is not a proportional relationship. *It cannot be used with high-energy pulse lasers.