Local tourist spot in Bangladesh. I bought my first 10 stop ND filters from amazon for about 10 bucks. I was sadded to find out that 3 ND filters stacked and a polarizer gave me only 6 stops of light reduction. Even I had no choice to get a new set before the tour I tried to stop down my aperture to f 32 to darken the environment. It was a rainy day so i was lucky to get about 10 sec of exposure, enough to capture some motion of the water which was moving very slowly.