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Optical filter / neutral-density
The Neutral Density Absorption Type Filters (with custom transmittance, dimensions and shape), delicately manufactured by Altechna, generally functions through minimizing the intensity of light even without modifying the relative spectral distribution of the energy. Through the utilization of an absorbing type glass, attenuation may be accomplished.These filters feature a material composition made from neutral density glass with a diameter tolerance of +0/-0.2 mm. In addition, its surface quality is 60-40 Scratch and Dig.