If you have thumbed through the pages of a photo magazine recently, chances are good you have seen the stunning effects created by ND filters. My palms start sweating when I see puffy clouds streaking across the sky. I know these clouds will look magical when I shoot at slow shutter speeds from 1-4 minutes using my 10- and 15-stop Singh-Ray Mor-Slo ND filters. Honestly, I look at clouds differently now knowing what transformative effects I can create using these filters. …