I never know what will happen when I go out to take photos- I like it this way. I carry lenses for all situations and scenes. Sunday morning I was driving around Otter Tail county, MN. looking for birds to photograph when I saw a sign for Phleps Mill. I thought there must be water flowing there, so I drove to the mill. I saw water flowing over a small dam and found a place to set my tripod. I put a 10 stop ND filter on my lens, shot a 1 minute exposure, and got a very nice photo with soft, smooth looking flowing water.