A few years ago, I stumbled across what I’ve dubbed the “cellophane effect” when shooting moving water. I found myself exploring it again a bit the other day as I took some photos along Fargo Brook.
The key to achieving the effect is a fairly slow shutter speed (~1/25″) and shooting with the sun in front of you so that the light is bouncing directly off the water towards the lens. The light traces fine squiggly lines across the moving water.
Panasonic GX8, Lumix 14-140mm lens @ 140mm, ISO 100, various apertures, 1/25″ exposure.