The viewing filter works just like an ND filter to protect your eyes by reducing the amount of light to help you determine the position of the lights or sun.
NiSi Viewing filters are made of aviation grade aluminum with optical glass. Silicone eye cup is designed to prevent light leaks.
V-ND VIEWING FILTER
Made of 2 to 6 stops variable ND
Observe general brightness of light and eliminate polarized light
STOPS IRND VIEWING FILTER
Made of 10 Stops IRND
Nano Coating Technology
Stop UV and IR light while reducing visible light