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    Neutral Density Filter
    Specifications
    Material Fused Silica, BK7, B-20 Optical Crown
    Diameter Tolerance ¡À0.2mm
    Thickness 2.0mm
    Parallelism ¡À3 arc min
    Design Wavelength 400nm-700nm
    Optical Desity Tolerance ¡À5% at 546.1 nm
    Clear Aperture Central 90% of dimensions
    Model Material Diameter(mm) Optical Density Transmission(%)
    FND1-B12 BK7 12.7 0.1 79.4
    FND5-B12 BK7 12.7 0.5 32
    FND10-B12 BK7 12.7 1.0 10
    FND15-B12 BK7 12.7 1.5 3.2
    FND20-B12 BK7 12.7 2.0 1.0
    FND30-B12 BK7 12.7 3.0 0.1
    FND1-Q12 Fused Silica 12.7 0.1 79.4
    FND5-Q12 Fused Silica 12.7 0.5 32
    FND10-Q12 Fused Silica 12.7 1.0 10
    FDN15-Q12 Fused Silica 12.7 1.5 3.2
    FDN20-Q12 Fused Silica 12.7 2.0 1.0
    FDN30-Q12 Fused Silica 12.7 3.0 0.1
    FDN1-B25 BK7 25.4 0.1 79.4
    FND5-B25 BK7 25.4 0.5 32
    FND10-B25 BK7 25.4 1.0 10
    FND15-B25 BK7 25.4 1.5 3.2
    FND20-B25 BK7 25.4 2.0 1.0
    FND30-B25 BK7 25.4 3.0 0.1
    FND1-Q25 Fused Silica 25.4 0.1 79.4
    FND5-Q25 Fused Silica 25.4 0.5 32
    FND10-Q25 Fused Silica 25.4 1.0 10
    FND15-Q25 Fused Silica 25.4 1.5 3.2
    FND20-Q25 Fused Silica 25.4 2.0 1.0
    FND30-Q25 Fused Silica 25.4 3.0 0.1
    FND1-B50S BK7 50¡Á50 0.1 79.0
    FND5-B50S BK7 50¡Á50 0.5 32.0
    FND10-B50S BK7 50¡Á50 1.0 10.0
    FND15-B50S BK7 50¡Á50 1.5 3.2
    FND20-B50S BK7 50¡Á50 2.0 1.0
    FND30-B50S BK7 50¡Á50 3.0 0.1
    FND1-Q50S Fused Silica 50¡Á50 0.1 79.0
    FND5-Q50S Fused Silica 50¡Á50 0.5 32.0
    FND10-Q50S Fused Silica 50¡Á50 1.0 10.0
    FND15-Q50S Fused Silica 50¡Á50 1.5 3.2
    FND20-Q50S Fused Silica 50¡Á50 2.0 1.0
    FND30-Q50S Fused Silica 50¡Á50 3.0 0.1