We went out early this morning to photograph Minnehaha Falls. We went there during the holiday weekend and it was mobbed with people making "serious" photography impossible. Today was a Tuesday, it was misting and there was nobody in sight. Ginny was anxious to try some more long exposures of waterfalls. What we found was that the G15 and G16 both have a neutral density filter effect. It is worth three stops. That is enough under the conditions today to get a 0.8 second exposure which is plenty to get that silky appearance of the waterfall. Things worked out nicely. Notice that there is a heron standing on the rock. He held still for the exposure. It was hard to get him trained to do that.