Underwater frazil on the Kananaskis River, AB (Canada) Feb. 19, 2013
Here’s a shot of the underwater camera system MSc grad student Vincent developed for measuring suspended frazil particle sizes. In between the camera and the light, there are two polarizing filters – the camera takes photos of the frazil particles as they pass between these two filters. To see an example of the type of photos this system takes – check out this earlier post.
(photo by Jennifer Nafziger, Nikon CoolPix P310, f/2.8, ISO – 100, FL 4mm, 1/50 sec. exposure duration)