How many stops to use? You have to ask yourself, how long do you want your shutter speed to be. Once you know that, calculate backwards to your meter reading at the moment, and you will knows how many stops you need.
Last edited by daredevil123; 2nd September 2010 at 02:29 PM.
I see.. thanks for the info.
I suppose it's a very big difference in ND2 and ND8 v
Ok, shall read up more on how ND stops affect exposure.