Linear variable neutral density filter is used to attenuate light as the filter is shifted. The filter can be used for white light as well as for lasers. A large finite aperture can be attenuated by translating two filters in opposite directions..
● Parallelism：3 ´
● standard linearity：±5%
● standard deviation of density end point：±5%
● surface quality：80-50
● coated area：More than 80% clear aperture
● design wavelength：380-2000nm(B270)/ 250-2500nm(fused silica)
● calibrated wavelength：550nm