I've been wanting to work with twilight for awhile. There seems to be a sweet spot where you can take photos and still get the paddler focused while the water blurs. It seems to be just a few minutes that it works good as you can see the difference between Calebs shots and mine. Yes I could go out and buy a light meter and pin point it exactly...but that would take all the fun out of it. Verm was rocking tonight! There'll be a crew down there Tuesday around 5ish!