Like the title says this afternoon I had my first attempt a photographing long exposure water trails. The afternoon was cloudy all were shot at ISO 100 f/22 200mm on my PL 45-200 with an ND2 filter on the front even then the slowest shutter speed I could get was about half a second. So the trails aren't as "ghostly" as I'd like but for a first attempt I can't complain. I expect the ghostliness of the train depends on the volume of water, speed of water as well as the shutter speed. So all in all I'm quite satisfied with a first attempt.