This shot presented itself toward the end of the day's light. This camera I rarely move from the position of ISO 100 because it seems to prefer to be there, yet this location is in the bottom of a ravine-like area where the departing ambient light was all that remained. This is an excellent example of how the capture tries to show the way if we will listen. I had been using the CP filter to balance the effect of reflected light on rocks and boulders against the available luminosity in the water, while also having it serve the duty of holding water protection in place as I hung down into this position. As I considered removing the CP I realized that by working myself into an area of higher velocity flow I could still obtain the effect I was attempting to save for memory without removing it to gain light...velocity choice made the image possible. Another fine gift of photography as meditation.