thanks neo_lam, IeR. Now I am pretty clear about it. .

Thanks to albnok too. Traditional sense is to reduce the light to the lens but modern sense is to make the picture more saturated? No?

If I am not mistaken, some ND filters are divided into 2 parts, one part is clear and another is darker - to compensate the bright sky. Am I right?

This post has been edited by Seng_Kiat: Jan 15 2010, 09:53 AM