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Anti-Reflection Filter (AR coating)
Anti-Dirt Coating
Black Coating
Black Chrome Coating
Cold Mirror (Heat Transmission Filter)
Color Correction Filter
Dichroic Filters
Diffuser / Frosted Filter
Dielectric Mirror
Hot Mirror (Heat Reflection Filter)
Hard Coating
Honeycomb Louvers
IR Cut-off Filter
IR Transmission Filter
Neutral Density Filter
Pattern Glass Window
RGB/CMY Mixing Filter
RGB Bandpass Filter
Reflective Mirror RGB
Reflective Mirror Red
UV Cut-off Filter
UV Transmission Filter
Welding Notch Filter
Neutral Density Filter

Neutral density filters or ND filters are “grey” filters. They are used to reduce transmission and increase contrast. Kupo neutral density filter is ideal because it reduces light of all wavelengths or colors equally.
Reference color #LEE 209
400~700nm Tavg=40% +/- 3%
Reference color #LEE 210
400~700nm Tavg=20% +/- 3%
Reference color #LEE 211
400~700nm Tavg=6.5% +/- 1.5%
Reference color #LEE 299
400~700nm Tavg=2.5% +/- 1%
Technical Specification
Humidity, Adhesion, and Abrasion Resistance is based on MIL-M-13508C regulations.
Custom Design Flexibility
Kupo's experienced engineers are available to customize the louvers based on the specs you require.
Any request of a specified size and shape is welcome.
Please contact Kupo for further information!