Waterfalls and ND filters

In my August blog post (here) I tried using a 8 ND filter with some waterfalls while on vacation. The overall effect was pleasing, but the exposure times were only a few seconds. It later dawned on me, lets try stacking the ND 2, 4, and 8 filter together, then put the Circular Polarizer on top as well.

The weather wasn't the best, with it being overcast, but I managed to get some 25-30 second exposures of waterfalls.

The first set of photos are of 'Nymph falls' near black creek.

The last few shots are from Elk Falls: