Eliminates far red starting at 680nm which increases with the use of standard neutral density filters which can effect certain black material to go magenta and greens to look washed out. It stops working at around 860nm and therefore it allows through far IR wavelengths, where most cameras low band pass filter has already started to cut in and remove these wavelengths.
Using the density 2.1 create a loss of 7 Stops.
Weight: 0,100 Kg
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