Filters
　
Individual Neutral Density Filters

l Optical Density: O.D.
l O.D.=Log10 (1/T)
l Transmittance: T
　
Material: Schott optical glass or equivalent
Surface Figure: Commercial polish
Surface Quality: 80-50
Parallelism: less than 1 arc min.
Dimension Tolerance: ＼0.2mm
Thickness: 0.5-3.0mm dependent on O.D.
O.D. Tolerance: ＼5%
Clear Aperture (CA): central 90% of Dimension
　

　
O.D. Transmission(%) ThicknessAppr. (mm) Dia.=25.0mm 50.0 x 50.0 Glass Type
0.004 91.20 2.0 NDF004 NDF104 NG12
0.1 79.43 1.9 NDF010 NDF101 NG11
0.2 63.10 2.0 NDF020 NDF102 NG11
0.3 50.12 2.3 NDF030 NDF103 NG11
0.4 39.81 3.0 NDF040 NDF104 NG5
0.5 31.62 1.8 NDF050 NDF105 NG5
0.8 15.85 2.3 NDF080 NDF108 NG5
1.0 10.00 2.5 NDF100 NDF110 NG3
2.0 1.00 1.5 NDF200 NDF120 NG3
3.0 0.10 2.0 NDF300 NDF130 NG3
4.0 0.01 2.0 NDF400 NDF140 NG1

.

 
　
IT IS COPYRIGHTED 2005(c) BY LIN-OPTICS