Absorptive Neutral Density Filters possess level spectral transmittance characteristics in the visible region and attenuate light by absorption with minimal reflection. Typically, 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. They are useful in light control applications for measuring instruments and exposure control in imaging. Spectral variations occur as optical density increases.
Capability
Material: | Neutral density color glass |
Surface Quality : | 60-40 scratch & dig (MIL-PRF-13830B) |
Surface flatness: | 1 λ per inch @ 633 nm |
Parallelism: | 3 arcmin |
Clear Aperture: | 90% of diameter |
Design wavelength: | 450-650 nm |
Optical density Tolerance : | +/- 5% of density |
Diameter Tolerance: | +0.0/-0.2 mm |
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