I would like to buy ND filter for daylight long shutter speed pic. I think if its sunny day, typically the shutterspeed is about 1/4000, then I need about 12 stops to get to 1sec exposure....so what ND filter do you guys recommend?
I have a set of Cokin P series holder and understand from Cathay that they only have ND2, ND4, ND8 and NDX. I know about the first 3, but do you know how many stops is Cokin NDX?
PS: The Cokin NDX can be found in this page of their website, the product code is 156: