Visible light optical filter #48-527

neutral-densityglass

Hoya Absorptive Neutral Density (ND) Filters possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. Typically, the neutrality and density of absorptive filters are a function of the material and the thickness. Since Hoya neutral density filters are held to a specific optical density, the thickness is only a function of the glass type. Hoya Absorptive Neutral Density (ND) Filters are useful in light control applications for measuring instruments and exposure control in imaging. Spectral variations occur as optical density increases. Optical Density exhibits an additive relationship; for example, stacking filters with OD values of 0.6 and 0.9 yields a resultant density of 1.5. The optical density is related to the transmission by the following equation: T = 10^-OD x 100 = percent transmission. Attenuates Visible Light Via Absorption, Rather than Reflection Multiple Filters Can be Stacked for Increased Blocking Optical Densities from 0.1 to 4.0 are Available Also Available Pre-mounted in C-Mount Housings Need different specs or modifications? Edmund Optics offers comprehensive custom manufacturing services for optical and imaging components tailored to your specific application requirements. Whether in the prototyping phase or preparing for full-scale production, we provide flexible solutions to meet your needs. Our experienced engineers are here to assist—from concept to completion. Our capabilities include: Custom dimensions, materials, coatings, and more High-precision surface quality and flatness Tight tolerances and complex geometries Scalable production—from prototype to volume