I need to get a ND Filter, mainly for my rig setup but Im sure Ill find other uses for it.
I dont know what ND level to get, though.
ND.3 reduces the light by 1 stop
ND.6 reduces the light by 2 stops
ND.9 reduces the light by 3 stops
If No filter = 1 sec exposure (1 used to simplify math)
ND.3 = 2 sec exposure
ND.6 = 4 sec exposure
ND.9 = 8 sec exposure
Am I thinking in the right direction?