Spray form the falls was a major problem and I had a frustrating time trying to capture a few long exposures without the lens getting covered. It was a case of fire the shutter, clean the lens, fire the shutter and clean the lens. Time after time I did this until I eventually managed to capture a handful of images where the spray did not ruin the shot.
Compare this to the one below in normal conditions.
Text/Images Copyright David Forster