Neutral Density filter

Neutral density filter is also called medium gray density lens, referred to as ND lens, its role is to filter light.This filter effect is non-selective, that is to say, ND mirror on a variety of different wavelengths of light reduction ability is the same, uniform, only play the role of weak light, and the color of the original object will not have any impact, so can truly reproduce the contrast of scenery.

Specifications of neutral density filter                                                               
Attenuation wavelength:200nm-1550nm
absorptivity:OD=0.5,OD=1,OD=2,OD=3,OD=5,OD=10,OD=20,OD=30

Attnuation wavelength:
1.UV wavelength:250nm to 380nm,transmisson after absorptivity 20%,50%
2.Vis wavelength:400nm to 700nm,transmission after  absorptivity 99%,90%,80%,70%,50%,30%,20%,10%.
3.VIS+NIR:400nm to1000nm OD=0.5,OD=1,OD=2,OD=3,OD=5,OD=10,OD=20,OD=30
4.photo-communication wavelength:1200nm,1310nm,1550nm,transmission after absorptivity 70%,20%,50%,1% 
5.Size:2mm to 200mm+/-0.1
6.Surface quality:40-20
7.Flatness:1/4lambda or better
8.protective chamfer 

Application of neutral density filter                                                                     
laser,camre, Optical attenuation filter ,
Security cameras, Uv measuring instrument  and so on.